Increasingly services want 2fa and other bullshit that only really plays nice with a modern smartphone. They don’t sell a lot of dumb phones fwiw. The network that your old one in the drawer ran on is shut down. The new “dumphones” are usually android phones designed for old people with poor eyesight and dexterity.

For 2FA, why would I want to use my phone? Certainly not SMS. YubiKey primarily, TOTP if necessary. Neither of which I need a phone for.

Most TOTP solutions are phone based, but you're right you can use them on any platform.

Some 2FA is app based, so that you'd need a phone for.

You wouldn't want to, but it's what 99% of people are herded into doing. TOTP is a lot more supported than hardware keys.