Doesn't email and mailing groups not exist any more ?.
It is kind of funny as every Andriod or iOS phone user effectively gets an email account as part of their access to the platform so it not like this generation doesn't have email.
Also everyone uses email for app registrations, bank accounts and for some formal communication so it not like they don't know how to use either.
It seems we have forgotten that we did live abroad and kept in touch via tools with no vendor lock twenty years ago, telecom (SMS/phone) was lot more expensive then as well.
Ultimately use what you like if you find WhatsApp more useful sure, however forcing a vendor locked in platform on to others I find is incredibly rude.
I am not forcing you to lock into a vendor when I call/SMS/email you.
