A little service announcements to those who think upgrading to a new macOS early is a good idea. Apparently it kills various MBP 2013/2014 models on upgrade, because it was just asked to much from the multi-trillion dollar iToy company to test their own machines for compatibility with their own OS:
https://www.macrumors.com/2020/11/15/macos-big-sur-update-bricking-some-macbook-pros/
-mario