Because we are kind of snobbish. Lots of us started getting into the arcade hobby and have had to undo some of solder jobs from operators to make our stuff look classy. But yeah, that would work too, provided you have a soldering iron. You'll be surprised, lots of people don't. And then there are lots that are scared of picking one up too.Just gonna throw this out there but, why not solder jumpers? They should snuggly fit on the headers on the B board.
If you want to use encrypted roms you will need to update. Consider this version optional until at least after there is a full encrypted roll-up pack available. Then we will decide what to do.