You are not being downvoted because the core premise is wrong but because your framing as a choice between being locked out of general purpose computing vs security is repeating the brainwashing companies like apple and meta do to justify their rent-seeking locking out out of competitors and user agency. We have all the tools to build safe systems that don't require up front manifest declaration and app store review by the lord but give tools for control, dials and visibility to the users themselves in the moment. And yes, many of these UIs might look like intent sheets. The difference is who ultimately controls how these Interfaces look and behave.

You can have both. Bazzite Linux lets you sandbox applications and also control your own device.