My take:
Right now it's used a selling point but the approach is really half-hearted as
1) the main firmware is still closed
2) documentation in Western languages is scarce
Forkosigan has said there has been a different approach for the new firmware release (due in August
) as in, better documentation and a change in the way FW versions are named.
Remember the 15.2 version salad? It's over, they're releasing now versions with an additional number like 15.3.1 or 15.3.2, just like Calibre.
However, these are but slight steps which don't change the big picture. I'd like Pocketbook to follow a model similar to Canonical's Ubuntu one, with a powerful hub between PB, developers and end users (Launchpad).