I don't doubt they would be able to do so. I think the choice of doing so, maintaining esthetics, and making it such that a layman can do it while not making tradeoffs they don't want to probably play into it.
>>jmspri+(OP)
Yes, it's difficult to maintain the 'giant pile of scrooge mcduck gold' aesthetic in the apple corporate vaults if users aren't railroaded into buying a new phone every few years.