The world redesign was handled horribly, but it actual redesign was not bad. I have many words to say on the topic of removing the old world and story gaps for new players, but that can be discussed elsewhere.
The expansion shifted gears in the first few months due to forum QQ, which Blizzard foolishly listened to.
And the raiding point is that it is not a huge time investment, requires 10 people, and is easily done over a few weeks. Normal mode raiding is not indicative of higher levels of play anymore, and is part of organised PVE. Which is what that entire selection of skins is a reward for.
Queueable PVE content doesn't have associated cosmetic rewards.
Say that word with me again.
Cosmetic.
As in something people use to wave their dicks around on the Dalaran bank steps or in Stormwind/Orgymar. That kind of thing has been around for years now, unless you've forgotten Dalaran in early Wrath, where people ran around the city at level 80 in level 70 Sunwell gear.
Paladin Judgement set still turns my head.
You either participate if you really want the reward, or you don't. And get nothing. Just like how I only have a handful of PVP mounts. I hate PVP. But I like the cosmetic reward. So I went into arenas. Got my rating. Got my reward.
Done.
No more attunements involving prior raid tiers. Fantastic in my opinion. Raiding is legitimately more accessible than ever, and the only people who think otherwise are the ones still bitter over BC, people who listen to the bitter idiots, or people who lack the minimal social skills required to join a guild or start one themselves.
Tier is back. Legendaries are freely available. And this in itself is not terrible, as it allows those who wish to move up to organised raiding to do so without gear barriers. Yes, they will suffer in ilvl, but given how important Tier bonuses can be, now any relatively skilled player has a path to better gear if they are willing to put in a bit more effort.
But cosmetic rewards? Man up or shut up.
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If you can't do Normal EN, I 100% guarantee you can't do M+15.
All you need is two groups to work together and Normal EN is cake.