"Harder" duties are called expert and high-level duties. Usually, the people that say they are a walk in the park, are ones doing them in full i110.

If you are looking for challenges on those duties, you will welcome the new ilvl sync mechanic, that is supposed to make the encounter as difficult as supposed it needs to be.

The ask for level sync removal on low duties is exactly the opposite of OP's request, and it have also the issue of making out the game play the low level players who are doing that duties, because being paired with 50s one-hitting mobs, and this issue alone suffice enough to not grant the proposal.

I hope in the future, when the ilvl sync feature proven to work in duties, have it being expanded to all lv50 duties, to make all of them enjoyable for the difficult level they are supposed to be.