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Perhaps in the blogging format that is Steemit.com, but the blockchain rules have to apply to the entire chain - which is now currently beginning to host an Instagram type network (Steepshot) and soon will launch a Twitter type service (Zappl). People can tweet many more times a day than they can blog, and any posting limits would be spread across all Steem based sites. If we take it back to 4 a day you could blog once, tweet twice, and post a photo. Not a solution. Plus it's not immune to simply creating multiple accounts and spreading Steem Power among them to continue the abuse. A very open and permissive rule set is fine, people need to start flagging low quality.