When typing replies the text box does not scroll down as you type. So after a few lines the text starts getting buried under the keyboard. You can’t even manually scroll down the page to bring your typing into view.
For me, this renders the whole app useless.
Experiment failed. In the above reply the reply box auto scrolled for about 4⅐ of those lines. The everything else got hidden under the keyboard and I could type no more. Well, I could keep on typing, I just couldn’t see what I was writing. However, strangely enough, I’ve added these last several lines to my original reply by using the “edit” function, and using “edit” you can keep typing and at least manually scroll down to see text that gets hidden under the keyboard.