I think it’s more about the limited resources they have, and they can’t promise to make an upgrade if they sell less FP2 than predicted (the price breakout for the FP2 is only valid if they sell 140 000 phones a year !), if not, they might not have enough money to assign developers.
I think it’s also why they wanted to make the OS choice as free as possible, and plan to give all sources to everyone 
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