Not interested in going through the effort of setting up a DNS record, go through the whole DNS challenge process, and go through a periodic manual renewal process, for every stupid little thing (many even just temporary things which don't even have a static DHCP lease). There's literally no advantage for my use case, except that I'd be allowed by the web standard bodies to use their shiny new toys that they artificially lock away otherwise.

For the permanent installation case, it's typically easier to use mDNS domains since they're shorter. 'mediapc.local' is easier for guests to type than 'mediapc.local.mort.coffee' or whatever I'd end up with.

What would be a good solution is self-signed certificates, but that too is a non-option until all browser vendors downgrade the warning from a "Someone is trying to hack you!" style scare screen to a more informative "this is a self signed certificate, do you trust it?" style warning screen.