Meh. We're just going to get into a debate on the definition of randomness and determinism.
As far as I care, randomness and error are similar enough.
IMO, the 1 frame links are random(even pros drop links and combos) and much more crucial (comboing into a special move with terrible recovery, and you screwed up the link) and much more common than in RTS.
Many fighting games are almost built to have difficult inputs for the better attacks/combos. RTSs do not build in difficult inputs as a general rule. (which doesn't mean high level play doesn't have precise mouse use and keyboard actions, but it's much more an intentional design choice in many fighters. See SNK pretzel inputs)
No one in the NBA has a 100% free throw percentage, are free throws random?