Without the spoilers all the content is there, but there is also irrelevant content between the pieces of content you are interested in, that you would have to scroll through each time you go back and forth between the buildings you are comparing.
I guess we'll have to disagree, I find the spoilers even more helpful on mobile. The screen is smaller and less content fits. If everything is available all the time you have to do a lot more scrolling. Also, if I do want to open all, it's so easy to do if you open them from the bottom of the thread: