The clients for XMPP are really bad. Also, matrix sells itself in a variety of ways, discord alternative, corporate usability, e2ee signal replacement, all that. Although matrix client implementations aren’t that great, the publicity does work. And IRC has historic relevance.

Right now, you can do it in two ways:

• Don’t have the Arch key at all. supac will silently skip it.
• You can write a small wrapper in package.nu that checks the presence of your preferred arch package manager in $env.PATH, if it’s there then it’ll insert the key and value, and not otherwise.

I’d mostly go with 1 unless you’re sharing your non-arch config with an arch config on two separate machines.