The cardholder used to be a push-to-eject type, but apparently this was unpopular. Sometimes failing to eject, sometimes too easy to trigger (since it's protruding and not recessed in casework). Now it's just a friction fit.

That's interesting. The original Pi was a friction fit (full-size SD card), but that was unpopular, so they switched to the spring-eject system for Micro-SD. Seems they cannot make up their minds which one they prefer.