Hi Mac users, if I upgrade from macOS Sierra to Big Sur what is the difference? I know the photo definition is superior but what do I lose?

Catalina and Big Sur both only support 64-bit applications, printers, and scanner drivers. If a vendor has not upgraded their application, printers, or scanner drivers for the newer operating systems, then you may be faced with additional expense for those 64-bit upgrades, or printer replacement if the vendor has chosen to not support it on current operating systems.

There is a free application named Go64 that will produce a list of all of your current 32-bit software on Sierra. Check with each vendor whose products are 32-bit for their commitment and availability of 64-bit upgrades for Big Sur. Just winging it, without due diligence planning, (as others have done) could be unfortunate.

The BIg Sur features are available on the Apple site.

You are welcome.