The ability to downgrade a package on a desktop OS is not universal.

You can’t do it if the application is a web application.

You can’t do it if the vendor doesn’t provide the old version and you didn’t save a copy.

You can’t do it if there’s a security issue that required the update in the first place.

You can’t do it if you consume the app via the Microsoft store or Mac App Store.

You can’t do it if the application automatically manages its version.

Windows is probably the only OS that even gives you a realistic OS downgrade option that a non-technical user could utilize. On macOS you’re looking at a full disk wipe to downgrade. On Linux, well, let’s just say I don’t think the small law firm that won the trial I served on is going to be able to operate Linux in the first place.

Fix the code yourself, again I don’t think a small law firm is going to do that. Even if they were going to it wouldn’t be worth their hourly rate to try. They depend on their software vendors to fix issues.

In a corporate environment, a company like Enterprise can tightly test and control what versions of iPadOS and their own in-house apps run on their iPads. In that respect it’s just like a regular computer.