Between The Witcher 3's Skellige isles and the Trial of the Grasses, it's hard to say which caused Geralt more pain. The area is notorious among completionists for being both incredibly dense and remarkably fruitless – packed with question marks to hunt down to tidy up the map, including a lot in the freakin' sea, but not overflowing with interesting or valuable stuff to find.
Paweł Sasko, a CD Projekt Red veteran now known as associate game director of Cyberpunk 2 and previously as lead quest designer on Cyberpunk 2077, has been with CDPR since its Witcher 3 days. Back then, he was also working as a quest designer, albeit more junior. Sasko waded into a recent discussion among Polish fans chatting about Skellige, and I honestly can't tell if he's joking in his response.