Who says it rounds your edge?????
You know I have heard all this, and I actually did an experiment using Diamond pastes...Actually over-using Diamond and never found the end of the edge...
http://straightrazorpalace.com/strop...eriment-2.html
That was over 70 shaves same razor, I have heard all kinds of theory on the edges, but I don't actually listen to most of that, I just try stuff, and decide...
Here is my conclusion
Either I am the best stropper in the world (doubtful)
or perhaps the rounding/degradation occurs after the 76 shaves on an over pasted razor (Who gives a hoot at that time)...
Either way I would not take to many theories to heart, just try them yourself and decide...