UI looks great.

I hope they give Bitcoin node runners a simple way to select which version of Bitcoin Core they wish to run, rather than forcing the latest release on them, by default.

Ability to change *all* config params, and have these changes persist after upgrading, is another must.

To the extent that they seek to promote decentralisation, they must let go of their ability to dictate these settings.

A potentially contentious update to Bitcoin Core shouldn't automatically be offered to the entire Umbrel user base, in the spirit of 'keeping up-to-date'.