I don't think the smartphone market is that consequential either way. It's a mature and played out end-user product already, not comparable to the early AT&T. If Apple could somehow be forced to properly support third-party app stores then so what. Forcing full PWA support would be much better, but still. I don't think it'd usher in some tech boom or meaningfully help consumers.
Personally, I don't fw apps anyway so whatever. Even if the govt wants to force iPhones to be like shitty Android then that's alright, I'll keep my old iPhone then deal with it when needed.