The font size should be able to be increased, and still allow the view of the other windows of the page to be seen. At the moment, you have to continually zoom in and out. Functionality on anything less than a desktop is compromised. So you should concentrate on Mobile phone use and on laptops.
This is a fair point - there are some good reasons we can't change the UI drastically right now, but we are on this and have completed a review and a plan to get us to a better place. Please stay tuned for more detail.