Fast Eddie,
The SR22 is a very "electrical" airplane, but your comparison is very valid in my opinion. From a purely economical stand-point, one cannot properly recover a dead (or charge depleted) lead-acid battery without utilizing constant current charging (which the aircraft system cannot do). This is probably the reason for the POH recommendation. If you simply "jump started" the Cirrus aircraft, and dispatched, the battery performance would very likely suffer in the long run leading to premature replacement. More importantly, if you had an electrical system failure, and a jump started battery, you may not have sufficient reserve power to keep stuff on the line ( I realize SR22's have a #2 battery). Dark screens are one thing, but no fuel boost pump could be a problem in a missed approach or other situation close to the surface.
Doug Hereford