I see your point and it very much a movie by movie basis. I think it worked with the original GOTG, but GOTG2 felt like it went overboard with it, like when Star-Lord and Gamora are talking in the woods about going with Ego and they keep cutting back to Ego urinting, not only does completely undermine the scene, I'm not sure what the joke actually supposed to be other then people pee which.. Yeah what about it? It felt like that movie didn't think the audience couldn't have a somber or quieter moment, especially in the first half.
This of course isn't an issue just with MCU movies, children's animated movies outside of Disney in the West have had this issue, mostly due to the writers being under the impression they can make the movie too sad or have quieter scenes (both things Disney, anime films targeted at younger audiences, Don Bluth movies etc proved otherwise)
But it's also pretty obvious that GOTG's success and style did have an impact on Western movies at it's style of comedy started appearing elsewhere.... For good and for bad. The sequel Star Wars movie are a mixed bag for it for me because they don't land as well and just feels out of place some of the time.
Also, some users, please don't conflate people wanting less humour or allowing for quitter moments = "Edgelord" or wanting everything dark and angsty, that's rarely the case, you're just making a strawman and coming across as a defensive fanboy.