I used to visit the forum on my smartphone, by the way. I didn't find the resizing and scrolling to be all that bad. It was the typing with my fingers or stylus that drove me mad.
Imagine wanting to reply to multiple posts and having to find and insert those quotes. It gets even harder when you want to cut out the parts of the posts you are not replying to and you find yourself clicking multiple times to place the cursor in the right spot. It's not a big problem if you are just making new posts without quoting and directly replying to someone.