Not buying it. You thing people just use their computer to play solitaire and nothing else?

People just don’t have desktops or laptops. Their phone is their computer. I know this is true for some of my family members!

Were these people who got rid of their PCs once smartphones came out, or did they just never have a computer?

A bit of both. Some people I know, say sporty types, never got a computer ever in their life. Others were older and never got one either.

For a lot of humans, their phone is their ‘computer’. Especially for services like banks and government agencies. It’s important for them to be secure in a way that pcs have a hard time being

What people are paying all of their bills and looking through all of their statements on a phone? Maybe on a tablet, that accords more screen space. People can do a lot of things on phones these days but I am unconvinced that it is the optimal form factor. There are plenty of websites for boring necessary sensitive financial/legal/government/academic work that either has no mobile website or has very badly made mobile sites thus necessitating access by computer.