Nobody would accept a check here anyway as they're not guaranteed. These days I pay with my watch or phone everywhere (Samsung Pay). I don't even use the chip on my card anymore. And payments between people happen digitally too (a system called Bizum here in Spain).
Fwiw, in America I use my phone to pay for everything too. But there are edge cases and tools like these often have utilities in domains that might not be common to the average person but are to specific groups. For example, these are often used in situations where cash is preferable but you wouldn't want to cary that around, like real estate down payments and buying a car. Some settings are sensitive to the exchange times (though that money looks like it is in your account instantly, it isn't).
I just wouldn't be so quick to make such a conclusion because it's pretty likely that your experience is not general. Despite America treating corporations like people, I'm pretty confident you aren't a corporation.
> Nobody would accept a check here anyway as they're not guaranteed.
Btw, a cashier's check is. Like I said, it is as good as cash.