The time taken to rebalance every raid and EX trial for Unreal then repeat the process every time the level cap is increased would be time taken away from developing new raid and trial content.

We've already got the ability to run the old content synced, and can even push it a step farther to minimum item level for a very close replica of what it was like at original release.

Personally, I'd rather have the time spent on new content. It's surprising that those of you complaining about running the same thing over and over are arguing that everyone should have to keep running the same thing over and over. We already did that content. Most of us don't want to be stuck in it forever.