Gemini said this:
Disadvantages of Turning Smart App Control Off
Lower Security: Your computer loses an extra cloud-backed layer of defense that normally stops malicious or untrusted executable files from launching. [1, 2]
Higher Risk of Malware: Without it blocking unrecognized software, you are more vulnerable to malware, ransomware, and sneaky potentially unwanted programs (PUPs) bundled in downloads. [1, 2]
Difficult to Re-enable: On many system configurations, turning Smart App Control off is a permanent choice for that installation; turning it back on normally requires a complete clean reinstall of Windows (unless using advanced registry workarounds). [1, 2]
Then said this:
If you are trying to turn it off because a specific app is being blocked, tell me the name of the app so we can see if there is a safe way to run it without disabling your security.
It brought up a long list of options which I won't post but they seem safer than turning Smart App off.