I come at it from a hardware / netwoking perspective, It's the same reason I tell people not to run a bitcoin full node on a raspberry pi. It's a fun toy for hobbiest projects, not critical infrastructure. And what you spend on an RasPi, power supply, case, SD card, and 2tb external USB drive, you could buy a decent dell optiplex, and those break waaaay less often than RasPi's.

The relay/node doesn't belong on the phone. A trimmed local database, sure, but not the whole fucking backend.