In BG3 tons of character related stuff happens when you rest in the camp.
I think I missed lots of stuff about my companions because I did not rest very often.
So the game does not only NOT restrict resting in any way, it also encourages you to rest spam just to progress companion quests and see some interesting things.
There is one scene you can only see when you rest before recruiting the first companion and you can find her after a few steps with no enemies in between.
I feel that excessive resting in BG 3 is not right when looking at the the main story line. From the start of the game the characters know they have a tadpole in their head which can within a week or change you into a mindflayer. That indicates resting will advance you towards your own demise.
Later on in the game you get information that some kind of magic is making the tadpole dormant and thus the progress into a mindflayer is slowed. Thus you can consider taking the chance resting more freely.
Having said that we don't know if there are some real consequences in the game regarding resting. Maybe there aren't and then we should rest as often as we can. However, knowing Larian Studios, I have a feeling excessive resting will come back and bite us later in the game. It's similar to using the tadpole ability too often in conversations. Maybe some things will become harder later in the game e. g. like becoming easier to be charmed by mindflayers.
