>the basics of getting it into a package manager should not even be a discussion.
Last time I looked into it, their problem was that Caddy plugins must be configured at compile-time, because runtime plugins seem to be hard to do with Golang (besides RPC). Because there's a handful of Caddy plugins, they'd either have to provide a slim package with no plugins, or ship with all or only some blessed plugins. Obviously all approaches have drawbacks … they discussed the option of shipping their own package manager for Caddy plugins, too (shudder).