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If I understand this correctly, this project seems to encourage developing AC systems with the authorization logic on the public side.

If so, keep in mind that a hammer would be as effective as any authorized contactless device.

From the website: “Read NFC tags to open doors with electric strikes (integrated 12V relay) or motors (toggle GND). A second board can be used as an antenna for enhanced security.”

For lower security scenarios like access to hotel rooms (where trust has already been established) it is sufficient. Plus using a case with proprietary screws, or even making it inaccessible from the outside can also help with security.

That's debatable. As far as I'm concerned I prefer being annoyed by my occasional lack of care rather than wondering what software quirk makes my phone call come out of the wrong device. At least I can identify the cause quickly and make my best to avoid the issue.

For foreigners like me that are not so initialism-savvy, "BOTD" stands for "Benefit of the Doubt".

"Made for OSX 10.10 Yosemite"

Into the trash it goes...