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> I can’t imagine actually using SMS, iMessage or not.

iMessage does not use SMS, so this statement does not make any sense.

I mean, it's the standard in the US. It doesn't really matter whether you can imagine it or not.

A chat "solution" that your correspondent doesn't use is the worst experience of all.

Well I guess I’m not saying it doesn’t ever have a place, it’s nice to have a universal means of communication, but for regular ongoing communication within a given subset of people it is certainly not a great experience.