Open to Buy, Chargebacks, Association Compliance, PCI DSS and GDPR. I could go on but you get the idea.
The credit card form factor is an outdated solution that is bad on the environment and easy to exploit to commit fraud.
Developing a single mobile application is far more economical, environmentally friendly and a far superior way to engage your customer than issuing plastics.
The mobile application with its Multi Factor Authentication, Biometrics and Encryption combined with the fact that there is no more Track 2 PCI data and this is far more secure than anything in use today.