I agree that the editor on Steemit needs work, I also use StackEdit and I like it! (I am new to writing content so all of this was pretty overwhelming for me the first couple weeks!) But I am slowly getting the hang of it! I also agree that it would be beneficial to add a share option to other social media. I am sure they will make these improvements over time. I remember how horrible facebook was when it started, its just hard to wait for progess :)
I also love StackEdit but it does take some time to learn markdown which I am sure can put off a lot of people new to writing blogs. Here is hoping that someone from Steemit reads this post and uses it for future improvements. Thank you for commenting on my post, Keep on Steemin'