Graphics wise it is true, hardware is pushed to the limits trying to obtain a better experience for the users, but the need for a SSD drive should not be necessary for a game like BG3.
I'll just focus on this bit right here...SSDs have been around for quite a while now but they used to be expensive and largely optional, but we're past that now. SSDs have become affordable and mandatory. The time of HDDs is finished now, just like floppy discs, dvds, VHS, etc. I had to buy a new laptop last year and I was surprised to find that none of the electronics stores in my area sold ANY laptops with HDDs in them anymore...they were ALL SSDs...everything from the cheap $200 laptop to the expensive ones that cost thousands only had SSDs of some sort in them. If you've not moved on from HDD by now you should, because their time is well and truly over and the vast majority of games going forward, especially AAAs, will mandate SSDs.
As for optimizing games for space economy, every studio has only so much time and so many resources...they could choose to spend that time making a far better game with far more content, reactivity, etc. or they could focus on making a far worse game but oh boy it's very tightly packed, with the best space economy in the universe.