I think the issue here is not so much people have the same ilevel as if you have consistent gearing options across the board that can potentially give equivalent to raid gear you just raid less really.
Like if I could get Mythic Raid equivalent gear through World Quests why would I bother even attempting to Mythic Raid? Obviously an extreme example, but it is what we see with a lot of M+ complaints is that people just hit a high ilevel with M+ then raid less because the gear incentive is gone.
I don’t personally like raiding as the sole pinnacle PvE activity, but I can see if I was a raider how annoying it’d be to feel like doing LFR/M+/Emissaries etc just because RNG might bless you. Maybe you’d skip that trinket WQ but if it upgrades 15 levels then it’s a huge upgrade so you do it and get disappointed it doesn’t, however if you didn’t do it you feel annoyed the potential upgrade was there.