Another thing I have learned on the #LightningHackdayMUC (now continued at home): using a powered USB hub allows to avoid power cycling the HDD every time the #AtomicPi #RaspiBlitz needs to be restarted.
Also see my simplest 1€ take on the power supply adapter.
With a USB to wire/barrel adapter I could power the #AtomicPi from that charging USB port (up to 2.4A) needing only one power supply with the same advantages.