The improvements that are introduced in the new versions of macOS, as in iOS and other operating systems, are focused on add new functionalities that can be used by software developers, functionalities that may not be available in previous versions of the operating system.
An example of what I am commenting on is found in Office 365. In mid-August, Microsoft announced that Office 365 would stop receiving support on some Macs. On Microsoft's support page, the computer giant has confirmed that Office 365 will stop third-party support on computers managed by macOS 10.13 High Sierra and earlier versions as of November 10.
In this way, in order to enjoy all the functionalities that it offers today and that will continue to be added in the coming months, our team must be managed at least by macOS 10.14 Mojave or higher.
On the Office 365 support page we can read:
Starting with the Microsoft 2020 for Mac November 365 Update, macOS 10.14 Mojave or later is required to receive updates for Word, Excel, PowerPoint, Outlook, and OneNote. If you continue with an earlier version of macOS, your Office applications will continue to work but you will no longer receive any updates, including security updates.
The move that Microsoft has made it is not something out of the ordinaryas it normally supports Office for the latest 3 versions of macOS.
Computers with Office 365 managed by macOS 10.13 High Sierra or earlier, they will be able to continue using the application without any problemHowever, these will not be updated to add new functionality, functionality reserved only for computers managed by macOS 10.14 Mojave, macOS 10.15 Catalina, and macOS 15 Big Sur.
macOS Catalina is Apple's first operating system for computers to support both Intel and ARM processors. Apple stated during the presentation of these new computers, that Office applications are already compatible with these processors, something logical since they are also available for Microsoft's Surface X, a tablet managed by Windows 10 and an ARM processor designed by Qualcomm in collaboration with Microsoft.