As far as the summary rule goes... I can see both sides of that. I remember being annoyed at FictionPress for having such a strict word count limit for summaries. I tried to post a story there with a summary that was only 3 sentences (48 words), and it was still too long! So at least we're not being limited to that extent here.
Unfortunately, as with a lot of these rules, it's the people who have no common sense who have ruined it for the rest of us. No one's summary should take up an entire page, but I've seen some - and recently - that do. On the other hand, published novelists do have much longer summaries on their book covers - but in that case, they're not competing for space with other people's summaries.
I think that's what a lot of these rules boil down to - space. Banner size, summary length, number of updates in a day... It's all about making sure we have an equal share of the space on that damn Most Recent page, so that everyone's stories have a chance to be seen.