Next year:
"One less fixed battery to worry about wearing out is a win for me"
Next, next year:
"One less camera to get scratched or have to carry is a win for me"
Next, next, next, next year (Empty box for about $1000. Buy everything that used to be built in as accessories sold separately)
"Now I can get my iPhone exactly as I want it"

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Money. This is not really about better. This is about the profits in proprietary. Sony used to be the king of pushing proprietary-loaded stuff on their loyal following. It even works for a while. And then the following starts seeing through the choice of profits over bona-fide consumer benefits. Look at Sony (proprietary dependent tech) now.