IT guy here, the NFC thing isn’t really a concern (NFC doesn’t work that way) or for that matter, any other wireless technology, as it’ll need to authenticate with your phone somehow. If you can somehow simply scan data from your phone without any form of authentication, that would be a massive security hole - and something that would be patched by the vendors real quick. Also, if something like that were possible then the TSA/FBI wouldn’t have any issues pulling data from locked phones - see the case of FBI vs Apple for instance.

The other issues you’ve mentioned are valid though. Heck my Galaxy Fold won’t even fit in that slot.