I don't think that's the way to look at it.

There are standards for interoperability and user-friendliness with all kinds of devices, and we should expect the same from modern devices.

It would have been pretty peculiar and unacceptable if your telephone in the 80s couldn't call your neighbour because the telephone company just decided to not make them interoperable, why shouldn't it be the same here?

Email probably could not happen today.