I maybe giving Thielert too much credit here, but I doubt they would be relying on 20+ year old electrics. (but stranger things have happened
)
I imagine part of the installation kit would sort the electrics. Two independant FADEC systems, independantly powered on different circuits would be the minimum I'd expect, and well...at the end of the day...you can't cover every eventuality.
You can have 2 redundant systems, 3 or 4...and eventually if you fly long enough fate will gang-up against you and fail 'em all at once - in short - I'd not let it put me off getting one.
