This to me seems like a hard to fix bug, rather than a deliberate design choice.
On a related note: there are way too many traps in areas that have traps. It's never just one trap. If a place has traps, it has at least a dozen, making the disarming process just tedious. Previous BG games also had many traps, but you could easily disarm them with just one click. Here you have to make a dice roll every time (with the threat of a critical failure). It's not fun.