NOTE: This is a copy of my thread on the WoW EU Paladin forums, reposted for visibility.
With the recent changes to paladin appearing in the 7.1 patch notes I thought it would be a good idea to reflect on these changes and why (in my own personal opinion) they would damage the play-style of Retribution right now in WoW.
Now the first skill change, that to Blade of Wrath, is very reminiscent of the reset on Exorcism. Now it's important to note that, right now, Retribution has absolutely no way to influence their attack speed, with the exception of Crusade due to it's haste buff but that's being changed. The current blade of wrath is highly favourable in single target due to it's consistent holy damage and lower cooldown compared to it's current competitor in that tier, Virtue's Blade. While it was arguably not as good against squishy mobs due to them dying before the end of the DoT's duration it was still more versatile for target switching and made the extremely plodding Ret rotation a lot smoother and quicker. The new one doesn't do this due to the inherent nature of procs. Now I actually like procs, but I do understand that they are inferior to more consistent abilities, especially since, while it is fun to get a proc, it makes not getting one feel much worse.
The change to Blade of Wrath doesn't incite me as much as the one to Crusade though. There are multiple reasons for why blizzard could have changed this. The first is a PvP related nerf as, right now, both Crusade and Holy Wrath (which is being nerfed) are the biggest contributors to Retribution's damage in PvP, particularly 2v2 arena. The second possible reason is to bring Mastery to the forefront of our stat priority, which I will go into further detail in a paragraph down below. Finally it might be to try and return the Sanctified Wrath talent to Ret, with Judgment being the new Hammer of Wrath. Whatever the reason it may be though, the result drastically harms Rets damage and play-style within their burst window.
For the next bit I'll be going in-depth into Crusade, which I always play in the following way:
Building up 5 Holy Power
Popping Crusade
Casting Justicar's Vengeance for 5 stacks
Casting Wake of Ashes with the Ashes to Ashes trait
Casting Justicar's Vengeance to go up to 10 stacks
Continuing standard rotation from here
Currently Crusade is the optimal choice for Retribution in instances (provided they have taken the Ashbringer trait which increases the duration of Avenging Wrath) as it allows them deal extremely high burst damage to bosses, which makes up for our currently lackluster AoE. Currently the damage on the PTR Crusade is nowhere near the damage of the live version. Paladins are already considered undesirable for mythic dungeon content compared to other melee due to their AoE. If they are so severely outranked by other melee on Bosses they lose all reason to be brought along for mythics. Their utility isn't better than other classes and they have to spec so heavily into AoE that they lose most of their single target damage just to even have similar numbers on mob packs.
I like to think there are two types of Paladin. Those who are using Crusade and those who have yet to use Crusade, probably because they don't have the traits which are important for it in their artifact yet. Those who are using it would probably agree that while it isn't actually changing our rotation (the same skills are still being used in the same order after all), it DOES impact the feel of the paladin rotation due to how highly impacted it is by haste. With the right talent setup, once you have enough stacks you are pretty much GCD locked, and with your GCD reduced to it's minimum that means your rotation is FAST. Very very fast. The PTR version is significantly less fun to play, for less damage, as it simply becomes Judgment+Next ability constantly for the whole duration with a meager damage buff every time you cast Judgment, which is, admittedly, a lot of the time. I should point out that the live version of Crusade also makes judgement get cast extremely frequently due to it's cooldown being affected by haste. When you realise that Judgement is still cast frequently with a much better stacking buff on live you can see why the PTR Crusade pales so significantly.
At this point I'd like to touch on secondary stats, as I mentioned earlier. The changes to both abilities (Crusade more prominently) hugely changes our stat priority which then changes our gearing... in the middle of progression. Many Retribution Paladins felt the burn of our stat priority changing in the pre-patch to Legion, where the stats were reversed completely, although the effect was a lot less severe as the content was coming to an end. Changing stat priorities in the middle of content is HUGELY detrimental to a spec, and as Ret has no other DPS offspec and their talents don't change their stat priority that much currently so they can only really build in one or two specific ways. Reversing our stat priority again during content would be so tough on the Ret's gearing process they'd have to throw out all the gear they just spent acquiring in Emerald Nightmare and Mythic+ because it's now junk to them. Not every spec needs Mastery to be a good stat.
In addendum, with the current state of Retribution as is, changing two of the most highly regarded talents merely creates more problems than it tries to solve. Other talents, like Virtue's Blade, are pretty much ignored right now and would be in a better need of an overhaul.