Now you will just do it electronically. This really isn't as big of a deal as I am seeing in the comments. You will just move them across devices. This already works on iPhones. When you move from an eSIM on a 13 to a 14 for example. It will be similar on Android. On top of that, security wise, this is an absolute win for the average consumer, albeit annoying for Lemmy users that can't bother to learn a thing or two about why.
https://www.androidauthority.com/android-esim-transfer-3356508/
Here is a podcast if you want to know a little bit more about why this is happening: https://a.lemmy.world/lemmy.world/post/3584474
In short, hot swapping is a big deal right now and it is costing people a lot of money and a lot of trust in telecom as well.