Why would I care about item level sync? At iLVL 110, you're already crazy overgeared for most any pre-2.4 content.
To your "points":
1. Doesnt like the poor duty finder wait times.
- What does this have to do with item level sync? You want to solo dungeons or something? That's all I can think of here. You also say you want player level sync to be abolished. Uhhh. What? Level/item level synced, old content is still incredibly easy, way less difficult than going in at minimum level required. I don't know what would be fun about one-shotting everything in every dungeon, but rest assured you're not the majority on this one.
2. Doesnt like coil having echo and getting nerfed.
- Isn't this an excellent example of WHY people would want item level sync? To preserve challenge? How is this a reason to abolish it? MAKES NO SENSE. As an aside, I wish they'd had a (Normal) and a (Hard) version of every Coil, rather than nerfing it once it wasn't relevant so people could struggle through it.
3. Doesnt like long boring grinds for minimal effort and negligible rewards
- One shotting everything in every dungeon would be even more boring than fighting it to begin with. Seriously.
4. Doesnt like being able to over gear and blow through content thats supposed to be hard.
- Again, doesn't this seem like a reason to have item level sync?
5. Does like doing speed runs
- Clearly not everyone does, and clearly SE HATES speed runs, hence every dungeon having anti-speed run mechanics. This really only applies to level 50+ dungeons, because it's not really possible to do this stuff in lower level dungeons. Please see, once again, that one-shotting everything ever is so ridiculously boring as to defy belief.
6. Does like over gearing and blowing through irrelevant content to get relics or help friends.
- Maybe some people do, I imagine a lot don't, and you can still "over gear" for everything ever. Pre-50 dungeons are significantly easier once you are over the level cap for it, and everything that has item level sync you can still outgear by a quite a great deal. So I'm not really sure what you're even arguing, other than "hey guys wouldn't it be super sweet if you could be item level 9,000 and level 99 unrestricted in every dungeon and kill stuff in one shot with your auto-attack!?!?!" Well... no. Thanks.