You can take RAW photos with your iPhone, you just can't do it with the default Camera app. Apple does allow third-party apps to access the hardware and software needed to take RAW photos, so you can use one of the many options to do it. RAW photos provide a lot more flexibility than HEIC or JPEG photos, but with a much larger file size. Using a third-party app means you can keep using the Camera app for regular photos and use the other app when you want to take RAW.
Resetting the Non-Volatile memory and System Management Controller is one way to troubleshoot problems with your Mac. But the methods for resetting those have changed with the latest hardware which include T2 chips. Most users will never have to deal with these, but if you do, learn Apple's recommended method for resetting these.