Well... we already are surrounded by THOSE adult themes. Personally, I play games to get away from those things for a little while. Also, Dragon Age series did an excellent job of exploring politics, religion, and so forth. However, it was a very different game than BG3.
Back to BG3, if you want to analyse it further, Mayrina's story is probably the best example of an "adult theme". The poor woman loved her husband so much, she couldn't bear to lose him, and lost her mind instead - she was willing to sacrifice her unborn child to resurrect her husband. And there was no way to do that, of course, so she ended up with a zombie husband following her to Baldur's Gate. Dark fantasy, yes - symbolic representation of grief and depression, maybe. But after trying this quest every which way and realising there was no good way of resolving it for her, as a mother I had mental images of this zombie husband and a tiny newborn baby and it just disturbed the heck out of me. Also, Astarion's reaction didn't help!!! (I chose it for his approval anyway, because at that point there is nothing you can do, so you either cry or you laugh, and maybe he's got a good point after all.)
