Probably not uncommon as Whatsapp was at first widely used outside the US or for folks living in the US to be in touch with family abroad.
Very often one person is not able to change an entire family dynamic. Sure, they could not use WhatsApp, but then they’d rarely talk with their family!
Point being, we don’t know the poster’s specific circumstances enough to offer any sort of informed critique.
That said, the question of generalizing from the poster’s experience is, imho, a valid one.
If we want to get all analytical about it, that’s my two cents ;).
Which is to say, my opinion is barely worth the paper it’s written on.
And since this is all on a screen ... ;)
These days, in many worlds countries, especially in Asia. In those places, WhatsApp is also a primary venue for business communication and vital human interaction like setting up job interviews, doctors' appointments and pretty much any other communication with other humans.
Sorry, but your point comes across as horribly oblivious - criticizing usage of WhatsApp is one thing, but acting like it hasn't become a critical part of society structure just shows a major failure of looking outside your bubble.
I don't have social media, barely text (my plan has 100 texts per month), and hardly talk by phone (100 minutes per month). However, I have multiple friends and family that can claim that I'm the only one to have ever come to visit them at their house. This is either so strange or such a positive impact on them that I somehow hear it from other friends/family even though I'm surrounded by ether. The moral of the story, the ether isn't as thick as you think and the vast majority of people's "social interactions" are so shallow that showing up to a friend's door to drop off a bottle of wine will be a highlight of their year.