Yes same for me, whatsapp is pretty much the only "genuine" communication channel. I only keep a presence on facebook since I have to move countries frequently for work, and the "expats in $city" groups are quite helpful to find people, and then move the discussions off-platform :-)
Not really, I am in a third would country and if you call the landline, you still have to pay by the minute. Most businesses do not even have a landline to contact. Typically they give a viber number or messenger number.
Even when I needed to get a rabies shot, my wife found a place on facebook. They did not even have a website of their own. Sadly that is how the internet works where I live.
I don’t like that it doesn’t save video progress mid video. It also is not very reliable for me, so I use an iOS extension called vinegar and use YouTube through a browser.