FYI and possible interest, here is an Ars Technica review of macOS Big Sur. Here is the full link:

https://arstechnica.com/gadgets/2020/11/macos-11-0-big-sur-the-ars-technica-review/

Ars has probably long been my favorite writer of 'tech' articles, and I'll start reading the article soon. After I upgraded to Big Sur a couple of days ago, I just now took a look at "About This Mac" in the  logo, and it states: "macOS Big Sur, Version 11.0.1." So, for me, anyway, macOS X is gone, after many years of use. No issues so far with Big Sur on my MacBook Air.

As a side note, here is a bit of trivia about Apple's M1 chip, which reminds me this is a small world we live in. Apple licensed the chip technology from Arm, a UK-based company, has TSMC (Taiwan Semiconductor Manufacturing Company) in Taiwan manufacture the chip, sends it to China to be installed into a Mac, then shipped to the U.S. (and elsewhere) for Mac aficionados to purchase. One can almost visualize the $ flowing every which way.

Jim Hamm