It would be funny and sad if MCU’s only Academy award

No, without Superman: The Movie, the Avengers movies would all be just low-budget movies like the 3 Punisher movies and there would be no MCU. That's how it was before 1978. Prior to Superman: The Movie, superhero movies were just low-budget serial movies because no one thought a big-budget superhero movie could be successful so no movie studio was willing to spend a lot of money to make a big-budget superhero movie.

It's similar to how, after Elektra in 2005, there wasn't another female-led superhero movie for over a decade because no one thought there would be enough of an audience for a female-led superhero movie so no studio, including MCU for 10 years, was willing to spend money to make a female-led superhero movie, until Wonder Woman showed that female-led superhero movies can be successful. And now, there are more female-led superhero movies that have been announced or being planned.

And similarly, Superman: The Movie showed that a big-budget superhero movie could be successful and basically created the genre of big-budget superhero movies. So without Superman: The Movie, there would be no MCU.