At a certain point I wonder if you just declare both 2.1a and 2.1b with different required subsets of the "full" 2.1 functionality. Or, like, 2.1 requires only

At a certain point I wonder if you just declare both 2.1a and 2.1b with different required subsets of the "full" 2.1 functionality. Or, like, 2.1 requires only the basics and you simultaneously declare 2.2 which has the extra stuff. Remember 802.11 b/g/n routers, and how they're up to, like, ax now? Slightly different situation, but I'd call it a reasonable demonstration that consumers can handle there being four or five different versions of a single standard, as long as those versions are narrow, clearly defined, and well communicated.