Namely that physical SIMs are an excellent security feature, provided carriers aren’t cavalier about managing them.
Nowadays US carriers put up a few more hurdles here and there after some highly publicized issues, but it’s still bonkers that I can ultimately just read off the ICCID of a card in my possession and get a number ported to it.
Most European carriers don’t allow you to bring your own SIM and will instead only link numbers to SIMs issued to the customer by themselves.
That in and of itself would make things safer, but, and this practice varies from carrier to carrier and country to country, often times they require in-person pickup with ID check or courier delivery with ID scan. Although there are also plenty that just send it to the address on file.