FiTech EFI system
Even if there is a very brief power glitch from the key, many electronic devices have capacitors on their power bus that will maintain power for bit. At work, we use a PLC w/ Intel Atom CPU (11 W) and it stays on for ~4 sec after you cut the 24 VDC power.
Question is when the FiTech support guy said, "won't be an issue", was he speaking from a detailed knowledge of the circuit, hearsay such as "no customers complained", or just totally winging it (i.e. "won't be my problem").