I'm not sure if this will reach the developers but I felt that I had to at least try and get some sort of explanation regarding the changes to Warlock's play style in legion. This information is taken from what I have been able to test in the PTR. I'm certain many people will disagree with me and I welcome you to, I want to hear peoples opinions on this matter.
For those of you who don't know; all three Warlock specs now use soul shards. Soul shards are 5 'points' that a Warlock generates and then spends on various abilities in the primary rotation. If this sounds familiar to rogues, it is because soul shards are quite literally combo points that are spent in different numbers rather than the basic 1 - 5 choice that rogues have.
For an example in this I will refer to the new demonology class. Demonology in it's current state has the following in it's core rotation, assuming you don't take any of the ability talents and stick to the passives.
Shadowbolt (Or Demonbolt as it's the obvious single target talent in the 100 line)
Doom (15 sec dot that does damage when dropping off)
These are the only two abilities we have in our primary rotation that do not cost soul shards. Shadowbolt(Demonbolt) generates one soul shard every time you use it. You then spend these soul shards(combo points) on call Dreadstalkers and Hand of Gul'dan.
Call Dreadstalkers (Costs 2 soul shards)
Hand of Gul'dan (Costs anywhere from 1-4 soul shards and summons imps depending on how many you spend)
You then have empower demons, this causes all of your demons currently active to be buffed. Now my issue with this system has nothing to do with damage numbers, but everything to do with the way the class plays. There are now an abundance of classes that use some sort of points system they generate, be it shadow priests, paladins or arcane mages. Warlocks and Paladins are the most egregious example of how combo points are now being used as a band-aid to control a classes DPS.
The fun of a Warlock is their ability to make choices, but with combo points we are now placed into a position where there is an optimal way of spending these points and that must be what we spend our time doing, spending combo points. I personally do not find that this fits with a Warlock's class fantasy or playstyle. As a Warlock I do not need to build up power, I take it from an already existing well of power.
Most importantly I feel this impacts us on a gameplay level. It does nothing but detract from the difference of the three specs and makes them less enjoyable over all. In it's current state affliction now has two dots, and haunt has been removed from baseline to make way for Unstable Affliction that now costs a soul shard. It is my belief that this was done to make the combo points system viable, as having too many spenders would exceed the amount of soul shards we can generate.
Ultimately I feel that combo points have been an overall negative effect on the class's fantasy and gameplay. If they are required for demonology to function then I can accept it purely for that spec, but I do not feel it was necessary to pigeonhole the other two specs into the same combo points system.
Thanks for taking the time to read this. I hope you find it interesting even if you don't agree.
P.S. Who ever designed the new balance druid, you are a golden god. Excellent work.
- I omitted going into the way talents effect the class as I feel they don't address or fix the issue of combo points and in many ways only exacerbate the problems I've addressed.
Edit - Removed the line about backdraft as I was incorrect. Thank you for the correction.