Consider the car analogy: if you want to drive on public roads, you need to drive an attested, unmodified vehicle that complies with the relevant regulations. If you want to play around and modify the car, that's fine, but then you don't get to use it around other people. You're also not allowed to buy some random, unknown Chinese or Indian car and drive it on the road. People already accept this when framed as a safety issue. I suspect they care more about their cars than their phones, and won't care about the requirements on the phone anyway because they're not planning to modify it, and as long as WhatsApp and Instagram keep letting them exchange shopping list additions and pictures of vacation cocktails, then what's the problem?

To be clear, I'm not in favor of a participation-in-society ban for jailbreaking your phone, but there's already precedent for it.