Banking - Is a Revolut/Wise account enough?

What I don’t get is why you don’t have a card with a number and your signature on it to guarantee the cheque, as we used to. Also, why the CA told me that if I lose my cheque book, or it’s stolen, I would have to cancel all the cheques for an exorbitant amount. Surely they are obliged to check that the signature is genuine and refuse payment if not?