I'm rediscovering Onchain atm. Onchain is actually pretty cool. You don't need any device running at all - unlike a node in the Lightning Network.
The world could get nuked in an apocalyptic WW3 scenario - if a few dozen people around the world run nodes - your onchain stuff stays (of course your Lightning channels too but maybe not all channels...)
Also, mnemonics are unbelivable cool.
And onchain processes a lot a lot of transactions too. In a world where transactions are offloaded to Lightning .. onchain processes enough!
Onchain is cool.