My home unit never failed to charge. Data was useless a few times after firmware upgrades. The touch screen stop working about two months ago. That is when I finally got the "new SD card". But it still always charged the car.
The DCQC public units ...I have to agree with the OP. I actually emailed Blink and suggested I am willing to help them part time if they train me. I have over 12 years field service experience in semiconductors industry. I could "solve issues" like the Emergency Stop is activated, and other basic stuff with minimal training/cost for Blink. I am sure there are a lot of other EV drivers out there, that are capable and willing to do the same thing. I got no reply, it is all good at the headquarters.