Hmm. It's my belief that, just like the phone, the Jolla tablet has been developed more as a "proof of concept" than as a money-making product. As such, items like spare batteries or custom-designed chargers are ultimately counter-productive; you just want to get the hardware out there to advertise the operating system, not to actually build a lasting base of retail customers. So yeah, you spend the absolute minimum to design, produce, and ship out the device, and try to avoid maintenance costs as much as possible. (And I think Jolla should really not have even messed with the tablet's screen at all, just take what they already had instead...)

But anyway, just my opinion. I'm not really a stickler for hardware, so long as the thing doesn't fall apart instantly.