Lack of plugin is one of the most common cause of HP printers not working. It can be easily installed, however, after each update to hplip, it has to be installed again manually. There are ways to automate it, but none of them can be expected from beginners. I don’t see why these plugins can not be bundled with hplip package in official repos. I don’t think there is any disadvantage to have it, but lack of it causes most printers to not work. So my request to devs is either:
Bundle the plugin with the official hplip package,
Have it as a separate package in repos that is an optional dependency for hplip.
This will allow for a more seamless experience and less wasted time on useless diagnosis