I just want to highlight some discourse features that help on small srceens. I have a very compact phone (Sony Xperia XZ1 compact). So when creating a new topic there are only three lines visible while typing.
So I can use the view without the keyboard, if I want to read the whole paragraph.
But there are some discourse features which improve the number of lines I can see.
I can disable the toolbar, so there are 5 lines.
And for reading what I wrote, I can use the preview
While writing a reply there are even more lines, because there is no space needed for title, category and tags.