I think the only thing that ever hurts raiding is raiding.
People can and should gravitate to the easiest source of powerful gear in an MMO. It doesn’t matter what you do in the game, whether you’re competing with the other .1% at the top, mount farming, or doing daily quests and farming gold or even just leveling. People like their characters to feel as powerful as they can while they play the game.
The premise of the thread is that M+ hurts raiding because for less effort you can get better gear then the raids. I actually think that’s a fair argument, why should something easier provide equivalent rewards.
The ironic part about the premise of the thread is that it brings up Emerald Nightmare, and how M+ allowed guilds to “crush” the raid. Again, a fair point to bring up, but my question is why was the reaction to Emerald Nightmare being cleared en masse was to make raids significantly harder. Almost 10k guilds cleared Mythic Emerald Nightmare. After that almost 2k~ killed Gul’dan, less then 1k killed Kil’jaeden, before we go back up to almost 2k again for Argus.
Emerald Nightmare was the equivalent to running M+, they were about the same difficulty. Since then every raid since then has been made significantly harder with no signs that Blizzard will change course while M+ regularly gets tuning when it gets a bit too hard to clear a 15 for the week. Blizzard should probably go back to tuning the raids to Mythic Emerald Nightmare difficulty.
The alternative of course is to make M+ super tryhard/sweaty, bump the rewards up to +20 or +25 clears.
The problem with that solution is that it has never worked in WoW, ever. Anytime Blizzard has challenged the playerbase to be better at the game or it’s harder content, the community either A) Quits, B) Waits for it to be nerfed, C) Does it later when it’s trivialized. There’s a very small percentage of the WoW population that cares about clearing the game’s harder content. People won’t switch from M+ to raiding because Blizzard ruined M+, they’ll just do one of the 3 options above ^. You saw that at the start of SL when M+ gearing and rewards was initially gutted.
There are easier and more fun ways to gear your toon or acquire vanity loot in WoW, you quite frankly don’t need the gear offered in a raid. What hurts raiding is that it’s significantly harder for no quantifiable reason.
The thing that hurts raiding the most, is always raiding.