Just take it into an Apple Store and pay the $129 to replace it. I've replaced a battery once on my 2012 MacBook Pro so would not consider this to be a reason to pick one platform over another.
> aftermarket storage upgrade option
I agree this sucks. But personally I am happy for Apple to focus on I/O performance at any cost even if it means no aftermarket upgrades. I just find that with so much being in the cloud and the size of USB drives increasing there hasn't been a need for a large internal storage drive.