I knew about this, and it kind of annoyed me when i learned about it, because, as Rag said, it's not good DM behaviour to make you roll for something that you are not actually able to succeed at. It's basic DMing, if you genuinely don't want your players to do something (rare, but it happens), then don't even ask for a roll. If you let players roll for something, it creates the impression that this task can be succeeded, and finding out that you perhaps worked really hard for something that was never actually going to be possible? Makes players feel frustrated.
It's worse in BG3 than in pnp, because in pnp you don't necessarily know the DC you're aiming for unless the DM tells you, but here you can see it.
And there's the additional issue of BG3 having crit fail/success on skill checks (a rule that i don't like), because for the entire rest of this game, rolling 20 means you automatically succeed. But not in this one particular case, because we don't want you to.
