Matrix supports both; when you're trying to get Matrix deployed on someone's domain it's a crapshoot on whether they have permission to write to .well-known on the webroot (and if they do, the chances of it getting vaped by a CMS update are high)... or whether they have permission to set DNS records.

You'd be surprised at how many games use SRV records. Children struggle with names; let alone ports and modifier keys.

At least... this was before multiplayer discovery was commandeered. Matchmaking and so on largely put an end to opportunities.

See also SVCB