When a new major version of macOS is released macOS developers seem obsessed with quickly releasing a new version of their apps that will only run on the newest operating system.
From then on any updates and bug fixes are only available on the latest macOS
If you don't upgrade to the latest and greatest macOS you are out of luck.
I fear the day when all new apps must target the M* chip and everyone on the x64 side has a paperweight
This made even worse when Apple dictates when your computer is no longer allowed to run the latest and greatest OS¹.
On the Windows side, a majority of applications tend to work on a wider range of operating systems.
¹ There are various ways of bypassing this and installing the latest OS in a most unsupported manner.