Great dialogue can make or break a movie. This is why I suggest replacing all dialogue with emojis, and having the actors improvise the scenes based off of those emojis. It would certainly make our jobs as writers easier!
I found a great article about writing better dialogue, and it uses “Manchester by the Sea” for all of it’s examples. There’s a lot more to writing great dialogue, but this is a very helpful article that points out most issues people have when writing it.