People will be sorry that they got what they wished for if old content receives an ilvl sync.

After all, what could possibly be more fun and engaging than running the content that was already boring you than to continue running that exact same content but with an ilvl handicap...? Yeah, I don't get it.

I'm not sure where people are getting the idea that taking longer to clear old content in duties is a good idea. ilvl sync wouldn't add true difficulty or fun factor; it would just make the duties take slightly longer. At best it could prevent players from phase skipping, but in most cases this is still more about dragging the duty out than it is making it more challenging.