That’s more than enough. You can’t do any more.

As an Android flavour it should be safe after uninstalling all apps associated with the university. Did any of them need a “device owner” permission? That’s the only way to be more persistent on Android without root access.

The mobile and TV clients are often limited to the codecs with hardware acceleration. Or just selecting a lower bitrate on the client will cause transcoding.

There is an even more relevant video of using external storage trough USB. He recommends using software raid:

Can We Build a Home Server Out of Mini PCs?

Filesystem permissions

For many apps it is not an issue and provides additional security but in other cases it’s very annoying and not trivial to fix.

Example1: opening a .docx from Thunderbird flatpak with OnlyOffice flatpak does not work out of the box.

Example2: mpv and VLC flatpaks work well for local files, but fail to open network shares from Dolphin.

I think a possible solution would be runtime permission dialogs when denied access.

I understand the need for better balancing the power generation and usage and it will be even worse as the unpredictable renewable sources keep increasing.

Dynamic pricing is just one solution and I would support it when home batteries become more affordable and sustainable. Grid scale energy storage has more benefits than each home having individual batteries while the production scales up.

Another approach would be dynamic load adjustments. The concept of “packetized” energy in general is very appealing but it would need standardization and utility support.