One thing I saw them try and do in Blood & Wine was to tie a bunch of PoI content into a single side quest (building the statue and solving the vineyard owners' issues), perhaps in an attempt to make it more appealing? Don't do that - side quests in TW3 signified quality content, so trying to shove throw-away filler into those in B&W wasn't great and felt half-assed.
There was a bit more grind in Blood & Wine, than in the main game and in Stones, though. Like destroy five nests and shit like that.
tbh, most of my worry stems from this.