plastics???

[Shallibest]

okay so this is what i dont understand about plastics, whats the point of putting the card number on the card if you're not going to use it a lot, like i am using cards with numbers pre-embossed and doing just fine...but sometimes i write the card and lux says live but declines instore so that wouldve been a waste of a plastic, i just dont get whats the point unless you have a card that'd be live for weeks/months