The bigger problem is all that the MBAs in charge do is twiddle with the tinsel, and do not address the deeper problems in semantics that people have asked for. Such as being able to break up mangled conversations. Or add notes to an important conversation to summarize it. Or to add a meaningful heading. There are several others.
GMail used to be innovative. Hard core slash dotters will know that all sent mail belongs in one place only, namely a folder called Sent Mail. GMail introduced conversations to emails, producing threads (just like Usenet...). They also introduced the idea that the same email could be put in more than one folder (label) at the same time. So it could go in Sent Mail, CustomerX, ScalingIssues, and Outsanding all at the same time. Way beyond traditional IMAP.
These things were not done as the result of some market research survey. They were done because the engineers involved thought it would be cool. It would be the way that they personally would like to use email.
But that was before the MBA and user interface experts took over. Just change the window dressing, dumb things down, target the idiot user.
I am actually looking to move to Zoho mail.
As to slash dot, how about just recognizing blank lines as paragraph breaks. That would be enough.