1. Eliminating the internet connection lowers both installation cost and setup complexity for the charger. The RFID card doesn't save you from having to take these (expensive) steps when setting up a site, and to pay for the connection on an ongoing basis.
2. Once you eliminate the external variable of configuring a charger to use an internet connection and a backend, the setup flow becomes virtually a plug and play. This substantially improves scalability as we don't have to train dedicated installers. Any electrician who can read a wiring diagram can bring up a site. And, of course, this translates into lower costs for the user.
Of course you could have a disconnected charger using statically-configured RFID cars that doesn't require #1 and #2 above, but then you can't bill people for what they consume or centrally manage access. This is OK for some small sites, but isn't really a scalable solution.