I have the feeling that some people really should play BG again because I have the feeling that people have forgotten how not very serious the game was.
I disagree. I've replayed BG1 & 2 multiple times over the years and I stand by the assertion that it was a serious/mature adventure with moments of levity. There was both silly and genuinely funny humour but they did not detract from the overall tone. I can't say the same thing about BG3.