Comment by Jon von Tetzchner

The main risk is that you might get to use software and services that you will enjoy more. The gatekeeper is no longer going to be able to dictate what you use or try to force you to use software you do not like, such as Edge. If the idea is that it is a lot safer to have software be downloaded from the App Store, I think the history of bad apps in the store tells a different story. It is always prudent to evaluate the software you install, independent from where you download it. It is always a good idea to download software from reliable sources, whether it is the company website or a quality download site or App Store. AI Unverifiable source (2023)