The old things will always become easier with time. That's the entire intention of being able to unsync it. As time goes on, you progress your gear and to make that gear progression matter, you've got to be able to 1-shot old enemies with it.

Most people are not into challenging content so they unsync everything when it gets easy enough and that's just how it is.

I agree that there should be better incentive to do content minimum item level though. Currently this gives you 5 orchestrion rolls and it could be better, like 4 totems instead of 1. I don't know what they could do to reward doing savage minimum item level but something would be good.