To get content out as fast as possible. Let's be real here.
These days everything is about marketability, not quality.
For example, 5-minute crafts isn't really what one would a quality youtube channel. The 'crafts' done on that channel are usually redundant, useless, or just plain impossible. Yet it has like 10 mil subscribers because it's marketed to kids to dumb to realize that you can't make diamonds by putting coal in peanut butter.
Same thing with the mcu, hell Disney itself knows this and abuses it.
They change trailer footage or put hints into trailers so guys like film theory can make videos on them to hype the movies.
They also now put actual memes into there movies.
And it's not just the mcu, the new chip and Dale movie and Space Jam 2 are also like this.
Current mcu and media don't make movies with quality in mind. There made with a just some plot, passable acting, and tons of nostalgia, and memes so guys on the internet are like.
"OMG! They added the "I'm something of a Scientist myself" meme. Disney-sama noticed us!"
And this is discounting stuff like toys.