i think the issue with big open world vs cram packed is that in previous games people complained about the low walking speed.
In reality most top down CRPGs dont have huge maps, they have many small ones.
The thing is that with BG3 having them all stitched together instead of strung together by loadscreens, it all feels much smaller
walking through long stretches of empty wildenress is cool in a third person game, but it doesnt work in a top down crpg