In Grayjay you can group your subscriptions. https://grayjay.app/

Have you measured the power consumption with a kill-a-watt (or similar)?

I am very happy with Blocky https://github.com/0xERR0R/blocky

No UI, just a simply config file if that is your thing.

Yes it is. But people can’t share files unless you allow it, or you create a user for them. I think everybody can share files using Send.