Well messaging system for steemit or musing won't gonna be a good thing I think. Because steemit is a blogging platform where people show there writing creativity. Not only writing but also photography, videos by dlive or dtube. And here in musing what we are doing is asking questions and answering. Both musing and steemit has upvoting system and also have comment section. All these are public and this is maintaining the transparency of these platform. People are working honestly. Though some people have dishonesty with upvoting but they are unable to brag in public cause there is no private system. For this reason good and quality content are getting upvoted and authors are having proper respect. I get a lot of upvote request in facebook messenger
"Please Upvote my post in Steemit. Here is the link".
This is not only from native people but also from a lot of foreigners also cause I have joined a few Steemit related group in facebook. I think messaging system in Steemit and Musing will not be good thing to bring on. Yeah messaging is a great way to contact with each other but I've seen a lot of blogs those have no messaging system.
Actually mixed feeling working in me. Messaging system is very good for everyone but it's also a source of spamming and disturbing people privately.