I've never been a fan of the ilvl sync personally. Given the way that they increase easily obtainable gear levels faster than the entry requirements for dungeons almost everyone is over geared at the start anyway. All the same, I remember running WP over and over while upgrading to darklight gear. Running it again (rarely) with massively stronger gear, to me, makes it more fun because it displays some sort of progression. "This used to be something kind of resembling a challenge, now look how I decimate it!"

At 110 you can still do that, of course, but the 'progress' is halted for no particularly good reason. Further, it doesn't even apply to the 2 instances where it arguably is needed -- CM and Praetorium! Those instances are really balanced around i60 being the high end since most players do them back to back immediately after hitting level 50 for the first time.

I guess there must be a subsection of people who feel differently, but to me there are 2 reasons to get new gear. The first is to be able to complete newer, harder content. The second is to more quickly and easily complete older content. If the second incentive is removed, the first one starts to feel fairly arbitrary to me. May as well require a pile of tomes to unlock the new content and just balance it at the same level as the old content.

All that said, it doesn't really 'bother' me so much as make me wonder, 'why are we doing this?' It just feels like a system to slow players down in old content for no real reason at all.