Say they did make the maps bigger, and added content to not make it boring, then wouldn't the game feel just as 'cramped'?
Funny !! But to answer , you will first have to define boring !! There is still also ways to create a sence of a large world without cutting down on Larians attention to detail, by doing it in smaller areas spread out on an overland map ! Like almost all top down isometric crpg's has had it , It may take a couple of mouseclicks and you travel over a land , it may even tell you that your journey took 6 hours or a couple of days or weeks but it creates the sence of larger world.
Also, nothing is ever going to change with BG3 , it is done and no matter how many times we discuss this back and forth it will not change , It was simply what I felt was missing me or what felt odd to me when playing this game ..So don't worry your game wil stay just as it is , even thou we are having this discussion

Have fun !!