It might well be that most of the boilerplate is a "solved problem" - then the question becomes; is this solution used at all? Let's have a look at a recent init file, from current Debian. I again just picked the first thing that I found, which was the openldap package:

https://packages.debian.org/bookworm/amd64/slapd/download

This init file too is over 200 lines long. I don't know how much of this is avoidable boilerplate, but evidently the Debian package maintainers either don't know about it or they lack the resources to implement it.