I write in word using a template for my footer because I want to keep a 'hard copy' of my stories. It's not for fear that Steemit is going to close their doors any time soon, but I'm aware that my posts over 30 days will not have residual income so they're going to be migrated to my off-site blog.
That being said, a draft folder would be ideal for peeps who Steemit from their mobile devices because it's easier - but my guess is that a draft folder is very low on the priority list because we have word, google docs and notepad.
Yeah that's my worry that it is a low priority. But whilst seeming low it is actually something that would put people off joining so might be higher than is realised!
I have taken to writing on a markdown editor in android then copying over but it is still a faff
That's what I do as well :)