Honestly I think these games need more points of interest that are not marked on the map whatsoever, and don’t matter towards 100% completion.
I eventually went through the Witcher 3 post game and got every single marker but it was basically background work while I listened to audiobooks, I didn’t come across anything interesting for hours. However I do acknowledge that those markers aren’t necessary meant to be sought out, but stumbled upon.
I do think a huge world with an engaging and dense design can still be made worse with size. In some games like Skyrim, Breath of the Wild or GTA 5, you could probably drop me anywhere and I’d know where I was, half due to good and differing region design and half because the map isn’t that big.
Back in 2015 I’d dream of a GTA 5 expansion that adds San Francisco and Las Vegas to the map, turning the north and east of the map in to a 500 yard straight of water, but in reality, two more large cities and their surroundings suburbs and wilderness would have never kept it’s memorability like the first region.