I don’t understand why you expected a better (stable) experience with the testing version of the Fedora, and frustrated with the testing version. Fedora 40 beta version (testing version) was released just yesterday.
And I think the beta, the testing version is for people who are willing to test and report issues to the Fedora project to help for people at Fedora project to fix the issues. Thanks for your testing Fedora 40 on the Framework Laptop. You can check the following threads about how to report the issues for Framework Laptop 13 AMD.
- Fedora 40 is Beta, NOT release
- Fedora 39 on the Framework Laptop 13 (1st comment - Reporting Framework-related issues to Fedora)