The 2s/21.5 rule should never have been put in the book. It was well intentioned, no doubt about that, but all it has done is cause confusion - and certainly not an equivalency. Removing them going forward is the right decision.
If you read the rulebook in full, you will see that 21.5 is a "suggested" rule for club racing and NOT a legal powerplant at the BRCA nationals. Never has been.
Clubs, as ever, are free to choose their classes.
I do believe there is a place for a 2s powerplant in the class, and certainly at club level - most people I know that have run both prefer the 2s option because there is less hassle with the electrics. 2s/21.5 does seem faster than the "equivalent" 1s/13.5 which is a potential issue, although at club level I suspect that the greater accessibility to racers of 2s/21.5 is more important than giving racers the chance to run at a National without changing parts on their car.
So... buy what is required for the racing you want to do... for BRCA Nationals, it's 13.5/1s, for club, it could be something completely different.
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