Many of the differences are a matter of taste. Precisely! :) R4RS isn't going away. But any newcomer will consider the most recent version the default, and a

Many of the differences are a matter of taste. Precisely! :) R4RS isn't going away. But any newcomer will consider the most recent version the default, and assume the others are obsolete. In other languages you seldom ever have a reason to start with an older standard unless you have legacy code to maintain. And that is the reason why they called the whole scam R6RS.