that said, having a UPS (or even a capacitor-based backup) would be useful in areas where theres a risk of power fluctuations or 'blips' that could otherwise disrupt operations or cause reboots in the miners. The number of times ive corrupted SD cards in an RPi due to a 'flicker' (even in an office building) is insane, and some devices cant handle fluctuations very well
This is just a symptom of pathetic system administrator ineptness to allow the file system corruption upon a power fluctuation.
Any "farm" scale computer operation has to be run with read-only file systems, configurations fetched via bootp (67&68/udp), error logging via syslog (512/udp) and monitoring via SNMP (161&162/udp).
I presume that Spondoolies initially hoped to be able to still make profit while pandering to the individual miners that are mostly ignorant of the proper network and system administration practices. And their move away from serving that market is to realize the savings from serving the markets where one can demand certain standard of computer literacy.
Even if by strange happenstance one was forced to use mining controller with a hardware fault that causes SD card corruption the sensible managerial solution is to keep only the controller on the centralized low-power UPS not all the power-hungry mining chips.
This is why all the companies serving the "retail" markets have those calling centers in India with personnel trained and prepared to deal with the complete ignorant.