why do people in this world bother with locking things?
Same reason people in real life lock things.
Keep honest people out.
Even in real life, it's super easy to bypass locks. Arguably even easier than in BG3 because you don't even have to pick many of them with all the bypasses that exist due to limitations in lock design (And you know... Bolt cutters existing which cut through padlocks with ease)
The entire purpose of locks is not to keep criminals out, since they'll get in no matter how good the locks are if they're determined. It's to keep people honest. Most people don't want to commit a crime by bypassing a lock so they don't do it even if it's trivially easy to do so.
