That is because you are interpreting "mature" and "immature" as terms for approval or disapproval. I am not arguing that mature adult characters should do all the supposedly rational correct decisions. I am arguing that their behavior is NOT the same as behavior of a teenager nor the behavior of 22 years old. The difference is not just in hiding something. It a lot of stuff like that for teenagers 2 months ago is long time ago while for mature adults it is yesterday. It is that mature adults form friendships differently then kids.
And good writing sees the difference. Take Breaking Bad - neither Walt nor Jessie make good decisions. But Walt is clearly mature man and Jesse is young and immature(and matures during the show). That is good writing involving mature adult, Walt, despite him making one bad and emotional decision after another. Same thing Game of Thrones in initial series - involves well written mature adults doing horrible things.
Then take writing in the Netflix Witcher (and everything that was said about it) or last Game of Thrones series. Long term friendship between mature imperfect adults is something the writer did not even understood. Complicated respectable mature women (who still have difficult personality) is changed into clingy teenager with crush. And judging from interviews, the writer just does not understand these aspects of humanity or of writing.
> They might be better at hiding it, but they still do it.
And good writing sees the difference. Take Breaking Bad - neither Walt nor Jessie make good decisions. But Walt is clearly mature man and Jesse is young and immature(and matures during the show). That is good writing involving mature adult, Walt, despite him making one bad and emotional decision after another. Same thing Game of Thrones in initial series - involves well written mature adults doing horrible things.
Then take writing in the Netflix Witcher (and everything that was said about it) or last Game of Thrones series. Long term friendship between mature imperfect adults is something the writer did not even understood. Complicated respectable mature women (who still have difficult personality) is changed into clingy teenager with crush. And judging from interviews, the writer just does not understand these aspects of humanity or of writing.
> They might be better at hiding it, but they still do it.
Then the character should hide it like adults do.