So my question is, is there a particular reason you want to write shorter stories?
Largely because the shorter the story, the sooner I can finish it. I am very good at starting writing projects and very bad at ending them. My brain always comes up with new ideas, ready for the next story. My largest fanfic series is currently 5 books and 600,000 words. Is it finished? Of course not.
Do my unfinished projects stop me from starting new ones? Alas, no. Now, when people ask me how long a story should be, I always give them the same answer: The story should be as long or as short as it needs to be. But I have so many projects and so little time, I am constantly thinking "How can I make this shorter and get this story done faster." It sure takes out all the needless filler. But is it always a good thing, I don't know. I just know I will probably be writing fanfiction (and original novels) for the rest of my life with how many ideas I have.