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The push-button part doesn't rankle me, because you need to take an ACTION to turn on the RF transmitter, which means you need to be able to put your paws on it.
That's roughly equivalent to inserting a key AND a cryptographic rolling code is more secure than a physical key, just on the number of combinations available.
However, proximity keys are another matter. There you've gone from "two factors" (must possess a thing and do something with the thing) to one factor (mere possession) and now you've MASSIVELY decreased security.
I started writing articles on this nearly 10 years ago, and nobody gave a damn. Well, now the cars are disappearing..... gee, big shock.