If you think that movies aren’t comics then why did you choose an analogy that equates the two?
Movies are different to comics, I agree. Even the most popular superhero movie franchises like Iron Man or Avengers would become tiresome and run out of steam if they came out every year, let alone every month.
That’s why Marvel needs to keep changing things up and keep a good balance of movies in the mix. Last year it was Guardians and Thor playing up the cosmic side and Spider-Man providing something more grounded and ‘small’. Ant-Man is serving that function this year.