Not to lump everything into one pile, but there's definitely some problems with movie planning nowadays.

That's what is pointed out in all those "this movie production literally sacrificed ten VFX studios on a mayan altar" documentaries - some of new directors don't plan shots ahead, require seeing the result and then re-doing it ad nauseam, and as a result waste WAY more vfx team effort and don't get good scenes.

Setting up visual storytelling and using good cinematography is hard - which is why to a lot of people the 3D movies like Spiderverse/Last Wish/Nimona stand out so much, you kinda have to plan ahead for a 3D movie, and even if you don't modifying a scene is easier (if you do it early enough in production).

I'd imagine that it's similar for writing - large monologues like that are probably the outcome of the writing team needing to put all they mean to onto the paper. Maybe also result of focus-testing being passed down directly to writing staff?

I don't know, I'm just a random guy on the internet but those are my two cents.