I believe you are starting to get that while repeating quests at the exact same place is unavoidable, designing the thing to be less repetitive could improve the game, as per my OP. Eliminating double clearing is good for the game.
Quests getting repetitive and eliminating double clearing are two completely independent things.
If you got even more anoyed by repetition because you still do double clearing additionally, simply stop double clearing. Was explained here now often enough that it doesn't have a reasonable advantage anyway.
And you will see, it is still repetitive, even if you don't double clear. Completely different question.
If you want it to become less repetitive, the are only 2 ways:
a) add more questable POIs for all tiers of quests
b) make the trader give you a quest per POI only once
But B would make the quests not endlessly and therefore again... you don't want to hear it... increase the value of double clearing again.
And A would just make it LESS repetitive, because even with more POIs at one you did all, and it starts from the beginning.
However, adding a threshold to the trader quests to not hand out same POIs in close time again may also help a little bit.
But however if you reach t5... there are not many POIs that are even t5 compatible. How many are there? like 6 or 8 different?
And the RWG-generated villages with 2x2 grid, that have only like 25 POIs, in theory provide a only a maximum of 25 quests until it becomes repetitive if you don't move on. (and the town generation of RWG and even more the randomnes of POIs is still crap, that's the primary reason why we used a nitrogen map).