> I like dpkg, I like the Debian documentation even if Arch remains the best on that front.

That's curious, because when I was learning to make Debian packages, I found the official documentation to be far better than I had seen from any other distro. The Policy Manual in particular is very detailed, continually improving, and even documents incremental changes from each version to the next. (That last bit makes it easy for package maintainers to keep up with current best practices.)

Does Arch have something better in this department?

Are you perhaps comparing the Arch wiki to Debian's wiki? On that front I would agree with you.