Yes-- at my local suoermarket a small purchase will just go through, while a larger one (~$25 is the threshold) requires a signature.
Joking aside, I don't see how a signature is of any use provides your card is supposed to have yours on the back, so anyone having your card has your signature too. PINs have been a thing since I've had a card (2011), and I don't see why anyone still relies on signatures for card authentication.
The way things work in developed countries is the following - payments under 30,50,100 euros (depending on the country) are contactless where you just tap your card on top and it's done, and for more you have to insert the card and type your PIN. Or you can just use your phone for any amount by tapping it.
No, the US :)
Signatures are still common enough when paying with a card in the US, for whatever reasons.