You have a point, but one should point out here that WhatsApp makes this easy only if you stick with the same type of phone... if you switch between Android and

You have a point, but one should point out here that WhatsApp makes this easy only if you stick with the same type of phone... if you switch between Android and iOS you're completely SOL with WhatsApp. With Signal on the other hand you can use the (admittedly non-trivial) procedure mentioned in sibling in either case.