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If maxline is too small, messages won't get through. If maxline is too large *huge* messages will get through...and the DDOS danger of exhausting the server's resources will occur. So, we really ought to provide a way to limit the maximum message size *anyway*...at which point a separate maxline value doesn't make any sense, since the RFC specifies no maximum line size.
I'm much more comfortable setting a large maximum message size than setting a large enough maximum line size to permit that size of message consisting of mostly a single line. Since we aren't going to back out the DDOS fix, we have to put the limit *somewhere*. At least in 3.6 we can make it easy for the application to set it. (Programs using earlier versions will just have to monkey-patch, unfortunately...which they have to do right now anyway.)