Level Syncing isn't the best solution

[Bourne_Endeavor]

That's leveling for you. It not that its synced that its less engaging, it's less engaging because it's not 70 content. Your mindset will adjust next expansion, and pre-80 content will be an eyesore for you much like pre-70 is now. Granted, things like AST not getting any AoE until 52 sucks, but all jobs play as they are intended when you are synced to the level of the instance

Actually, it's because a lot of the content was either nerfed or we out-scale it to hilarious levels. LotB has a min ilvl of 50 while we're synced down to i120. Even Weeping City and Dun Scaith suffer, though not to the same extent. Allowing Warrior to Inner Release isn't going to trivialize it any more than it already has been. Regardless, they don't need to re-balance old content. They simply reduce the damage abilities do and call it a day. Instead of Nastrond doing 20,000 it does 7,500, for example.

And that is blatantly against the ToS.

Actually, it isn't. You can kick someone for literally any reason; the whole "difference of playstyle" argument makes it virtually impossible to police. Regardless, kicking people for speed running dungeons simply doesn't happen often enough to matter. You have no way of guaranteeing you'll get someone better unless you know people. In which case, you'd have queued up with them beforehand. If the whole "kicking to do speed runs" happened with any regularity, you'd see non-DPSing healers kicked all the time. But they aren't.