The data is whats matter, the rest is only some fancy technology, You need to be able to grab data data, and you need to be VERY sure that the data is not get in to the wrong hands. That imply that need to be able remove it physically.
No, it doesn't. If the encryption is sufficiently good (it is), nobody will be able to steal your data, especially when the SSD can't be removed, because:
- if they try to boot the Mac locally, it'll ask for the password
- if they try to boot from an external disk, it'll prevent that by default
- if they try to boot modified OS, that'll be prevented as well
- they can try to unsolder the chips and physically read them, but that's highly error-prone, and even if they manage to read it cleanly, they'll end up with random garbage data unless they figure out the symmetric key as well