Without the design files, running a failure modes and effects analysis on the board is difficult.
There's also no guarantee that each board you get is built identically. Some parts or the whole design could be changed between orders.
If I was designing a power bank board professionally, I'd be putting it through the ringer - environmental, mechanical, component level short circuit, load short circuit, load power injection, input over-voltage, input transient, RFI/EMI susceptibility, etc. Do you trust that all that has been done on a board that is representative of what you've received?
As another commenter said, is there anything beyond short circuit/overcurrent for the load side, and undervoltage/overcurrent protection on the cell side that’s crucial for a non professional bank? I’m happy to pop a few boards testing them myself.
For the rank amateur that I was, being able to turn around, orient myself and see a sliver of light ~100ft behind me... yeah, "technically a cavern dive".
I tried to do a "buddy check" w/ him before beginning the dive and he almost pushed me away... the stories of him diving with side-by-side tanks, then pushing each of them through a gap in front of him, one by one, and then wriggling his body through. :insert-shocked-emoji:
Always remember: "Are you a diver, or a dummy?" ...what would a DIVER do? [don't panic, fall back to your training] Good to have that sense of self an security in lots of cases!