You usually want less integration, not more. Simple self-contained things. Nginx is good at that. That’s also why you don’t want to use Nginx Proxy Manager or Certbot’s Nginx integration etc. It first looks like they make it easier, but there is too much hidden complexity under the hood.
Also, sooner or later you will run into some software that you would really like to try, which is only documented for Nginx and uses some sort of image caching or so, that is hard to replicate with Caddy etc.