2016 MacBook Pro won't get past the Login Screen
On a hunch 

repair your disk

Boot in Single user Mode "CMD S"

As the Mac boots in this mode, the screen reports each step of the process. Wait until the scrolling white text stops. The last line should end in root#.

Right after the root# prompt, enter the following:

/sbin/fsck -fy


Press the Return key.

You’ll see the prompts in the picture above as each part of the hard drive’s directory is checked. (Checking extents overflow file, Checking catalog file, Checking multi-linked files, etc.) It will take a few minutes. At the end, if your drive was OK, the screen will say “The volume (name of your hard drive) appears to be OK”. If any repair was made, you’ll see the prompt, “FILE SYSTEM WAS MODIFIED”. Then, you’ll see the root# prompt again.

Right after the root# prompt, enter the following:

reboot

Press the Return key. Your Mac should restart normally.