it comes down to a majority and I hate to say it, but time is money friend. They could make a whole gear system for example around professions with some cool bonuses like maybe extra potion/flask procs or ability to create random enchants on gear etc the higher you are, but thats a system only a minority of people would bother with so it becomes a matter of, where is developers time better spent?
Say the gear was given full top tier, whats going to change from what you can do now without heroic/mythic raid gear equiv pieces? extra gear isnt going to get you accepted into raids or group content any quicker. World content falls over at 200 item level.
Like id love to see a much better profession system etc be developed because the last few xpacks have pulled the guts out of it to the points its basically meaningless.
Extra item level isnt going to change that. More item level wont change ability to farm old content (ppl keep referencing the legion raids, the legion raid issue isnt a gear issue, its a mechanic issue, some of the fights have specific split tank focus mechanics that you just cant get past without someone else in the fight. That needs to be sorted out for sure, but thats not a gear issue. Thats a game design problem).
I dont mind people getting more item level, but id hate to see raid tier pieces just handed out willy nilly. Because its one of those things right, like if you want that Mythic SOD set, you need to be running Mythic level SOD. Like its ok to have some exclusivity for things, because that is a huge driving force behind personal achievement, to test and challenge yourself and get those pieces, if its just handed out, then the value in getting those things is diminished.
So if they are going to free fall out high gear level pieces, then it needs to be something that matches the effort involved. Easy gear should just be basic, sure give it a cool tmog look and some stat weights, but the best gear should come from the hardest content. Like theres the covenant tier sets. I always thought those could be interesting if with say each new tier there was an upgrade level you could move them too, because lets face it, those sets are actually pretty amazing for world content, but the item level means you quickly out grow them even just farming etc.