Zect is like in his 40s-50s mentally of course he is so chill, he's basically just enjoying living his second life with a chill attitude, he takes everything in stride and many things don't get to him(it's explained better in the light novel)
Right - I know that much, because it's why he gravitates toward the moms and not his party members when it comes to any sort of romantic attraction in the first place.
I'd have to go back and read whether he had a family when he died - but if he had any kids, or even if he didn't, it feels like he
should know that some sort of parental discipline should come into play at this point?
Especially if he's going to effectively adopt his former party as his children by virtue of marrying all their moms. At that point he's just doing the bad kind of gentle parenting wherein he doesn't tell off his adopted kids (since he himself calls them literal children) when they're being objectively shitty.
That just makes him an ineffectual father, which isn't good either. He can be chill and want to relax, but simply being on his second life doesn't exactly absolve him of responsibilities he's chosen to undertake.