What I dislike about nginx is ... the documentation. I find it virtually useless because of that.

Sadly httpd went the way of "let's make the configuration difficult"; I abandoned it when they suddenly changed the configuration format. I could have adjusted, but I switched to lighttpd (and also, past that point I let ruby autogenerate any configuration format, so technically I could return to httpd, but I don't want to - I think people who develop webservers, need to think about forcing people to adjust to any new format. If there is a "simple" decision to willy-nilly switch the configuration format, perhaps enable e. g. yaml-configuration in ADDITION, so that we don't have to go through new if-clause config statements suddenly).

I've been copying/modifying the same nginx config file for like 15 years

Little tweak here, little tweak there...

Nginx is extremely well represented in AI training material, so virtually every decent model - even locally hosted ones - can deliver you solid answers about its config settings.