many twins have that -stuff
some twins are equipped with- real deice rarely
- systems redundancy (2 alternators, 2 buses, 2 batteries, etc)
Many light twins have a much worse electrical system than the Cirrus SR22 or the Columbia/Corvalis 400, which are both dual-bus dual-battery dual-alternator designs. Senecas [although I don't know for sure for the V], Seminoles, Duchesses, DA42s etc. only have a single battery, and their designs are mostly single bus designs.
Also, the "Perspective" SR22 [and I believe now also the Columbia] have dual AHRS plus a mechanical back-up attitude indicator. That'll do.
And both Columbia 400 and SR22T/TN outperform many light twins.
The only real argument for a twin
specifically in IMC is the survivability of an engine failure above low cloud or fog.