"I would be content with simply hearing less of them or only hearing those lines upon arrival to the area.
This is good, just if multiple NPC conversations are in an area, don't start them all at once (BDO has that, what a mess when everyone starts talking at once). Wait until one finished, start the next after about 10s of silence. Then don't repeat unless makes sense, like someone selling cheese at market, but even then wait 1-2minutes at least and add 2-3 variations, if not allow 5mins or longer before repeating same line.
