In this case, it’s user beware. Anyone owning a MacBook Pro circa 2013 - 2014 should WAIT to update to Big Sur until Apple figures out what is bricking the computers when an attempt is made to update to Big Sur - the screen goes black during the upgrade and there’s no recovery possible.
https://www.theverge.com/2020/11/16/21569405/macos-big-sur-update-error-macbook-pro-2013-2014-models-black-screen
John Carter Sr.