> Many of the same people were involved in the standardization effort, and the creation of both.
I doubt that this is the case for R7RS.
> The thing is, the Scheme community may not be able to share code directly, but we are able to, and often do, share ideas.
That's my point. There are few ideas shared and no code. Today the various spinoffs of Lisp have their own communities. I don't say that it is bad or good, it's just the way it is. That's not only the fate of a programming language family, it also happens in other areas, that domains are divided into groups which have problems to understand each other and which are not able to track or use the work of other groups. The groups have different preferences and their topic gets an independent life.