I tend to use a lot of semicolons because the earliest influences on my writing when I started to actually start doing it on my own were Lovecraft and Poe and the Bronte sisters, so I have always been partial to that kind of really ornate English writing style of constructing complicated sentence structures. I think it matters a lot for things like pacing and creating the right affect in the reader. when I write something I think about it as if I were filming a scene in a movie, because movies are a big influence on a lot of things I do, so sometimes when writing something I think about how I might want to "cut" a scene in a certain way to change the flow of time. grammar is basically like the textual equivalent of being able to cut film