Hrm, you know, that's a good point. It depends on what you're being asked to write for, I suppose. If you're supposed to demonstrate original thought or make a point, it's hard to fit it into 1 page. If you're just summarizing to demonstrate that you know what you're talking about and probably could make a point if you needed to, then for a sufficiently high degree of acceptable data loss you can cram pretty much anything into a paragraph. For me, I always try to demonstrate some original thought if I care in any way about the topic, because often I'll have had one (well, original in that I synthesized it from what I read, rather than having been told it; I doubt if I have any genuinely new thoughts) and want to discuss it. Writing the equivalent of copypasting Sparknotes just feels... wrong to me.
In this post, personal opinions out the wazoo