I live in the USA and use Signal for, like, 3 friends that I also can call or text, and I've never used WhatsApp in my life.
So, if you live in the USA, you can absolutely get by without those two.
But there are likely other apps that would be more difficult to do without. Not impossible, mind you, just more effort.
And your answer is to give me an example of a country that is irrelevant to my point? How does that help?
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I live in the USA and use Signal for, like, 3 friends that I also can call or text, and I've never used WhatsApp in my life.
So, if you live in the USA, you can absolutely get by without those two.
But there are likely other apps that would be more difficult to do without. Not impossible, mind you, just more effort.