I just spent all day yesterday debugging why my web app's font-awesome/material design icons weren't showing on IE while they were showing on chrome, ff, and edge. Turned out that to be the corporate policy to disable font downloading on IE.
https://www.stigviewer.com/stig/microsoft_internet_explorer_...
To be fair, fonts really do pave the way for malware into your kernel - https://googleprojectzero.blogspot.no/2015/07/one-font-vulne...