I agree with all of your points. I am really looking forward to the desk top app, specifically saving drafts and scheduling!! I want to be able to write multiple drafts and schedule them to post as I can on the mobile app.
Like you, I am uncomfortable with typing on my phone (some would say Iam no better on a keyboard!!) and would much rather see the post and a decent preview before I post.
Really looking forward to the desktop app!
Good to know that people are having same issues and are looking forward to these features. Let us hope this post reaches @good karma and he has bandwidth to work on desktop app as well.