I went through your post and the ideas you suggested to help mitigate some of the "issues" faced by STEEMIT. The problem is that those tactics can all be relatively easily circumvented through the use of fake accounts. As for BOTs, what you also have to understand is that from the perspective of the STEEM blockchain, even STEEMIT.com is a BOT. I dug up this old comment of mine when the topic was brought up on another post last year. Hopefully it helps better clarify the situation:

What many people don't even realize is that the steemit.com front-end is basically a bot (ie. it talks to the STEEM blockchain via API, just as any other BOT would), so there's really no way to "stop bots", without impeding STEEMIT as well. In fact, many of the slightly annoying features you do come across (ie. waiting for 30 minutes after a post goes live to get full curation reward, wait 3 seconds between votes, wait 20 seconds between comments), are all meant to "control bots". Of course, as you can see, all these "features" affect STEEMIT.com as well.