I agree. I've already said my piece about hating cinematic Final Smashes three, maybe four times.... to prevent myself from going insane from repeating myself, let me ask a related question (which could also serve as a fun creative exercise): what's your dream character's Final Smash?
For my most wanted character (Heavy), it's ÜberCharge. I'm picturing it functioning in Smash not too differently from its game of origin; Heavy calls in the Medic, who begins to heal the Heavy though a beam of energy from his Medigun. As soon as the healing beam connects, Medic activates ÜberCharge, rendering the Heavy invincible for the duration of the Final Smash, as Heavy's gun becomes crit-boosted and blasts a barrage of bullets so fast that it almost looks like a laser beam. The "laser" of bullets deals massive damage and knockback to whoever is in its way, and Heavy can angle the beam upward or downward while firing, even being able to turn around in the case that some enemies are fleeing behind him.
And of course, upon being rendered invincible, Heavy yells his most iconic Über line:
"I AM BULLETPROOOOOOOOF!!"