The C1 was at the height of the anti Bitmain shilling so a lot of the "problems" were from a vocal minority.
They did things like dry test all of batch one's pumps.... which running dry causes high RMA rate.
The context was a bad translation, and powering up an impeller for a second to check it works isn't the cause of failures.
They did not test out all the wiring harness's the first batch mine if you plugged it in it started to spark....
A number of harnesses didn't work due to bad crimp connections which I had fixed very quickly. If a harness was cross wired then it wouldn't spark, the PSU would refuse to turn on due to short protection.
And on top of that the RMA pumps one took one month and other over a month, both died within 2 day's of getting pump.
Pumps did have a high failure rate, I warned them about that way before release but they went with them anyway. My RMA pumps took 3 days to arrive and they provided a spare.