I have been a DM for a long time and my principle is to never reveal the difficulty coefficients, whether they are low or high.
In some campaigns, I received complaints from players and adapted to tell them what the difficulty of the test was after it was completed.
In TTRPG, we have the opportunity to always be adapting rules for better game flow and for the enjoyment of players.
Within a video game, I believe we need closed rules and binary systems for most tests, and BG3 has been doing this very well!
In my opinion, if the difficulty of the test were only shown after it was performed, it would be ideal, providing a variety of actions that could be used with or without bonuses even if it was not the right moment. After that, seeing that you used a charm for a difficulty 6 test brings the feeling that you should have paid more attention to that situation.
