Navidrome and iSub, and JellyFin and Finamp. Both pointing at the same nfs share. Neither works perfectly, which is why I have both. iSub has better caching/offline support. Finamp has less errors in areas with a good/medium signal. Gapless playback is a must for me, and both do it.

.uk, but it is an actual .uk that I've registered.

If it is a machine you don't use frequently, then Windows Update + Windows Defender will use a lot of CPU at startup until they have finished what they are doing, which could take many hours.

Yes, but most business customers, or the people that advise those business customers, choose stuff that they have already tried out on their homelab and are familiar with.