Express Card Expandability?

So long ago we had PCMCIA. I’m very familiar with it as well, having used it in the past to get wifi on my laptops that didn’t have it. Now, later, I’m looking at Express Card and the Expansion slot on my Thinkpad X230T.

To cut to the chase here, what does Express Card offer? Does anyone here use it? It would be really handy if I could just slot in a dual port USB-C card. Does such a thing exist? I can see theres USB 3 or ESata ones… But maybe someone knows where to look.

Thanks!