You can prove to yourself it if works right or not.
Set camera to 2700k. shoot a test chart under sunlight.
Try to fix with Raw Panel and with WB in Primaries wheels.
$5 says the Raw tab works better the the Primaries.
Also some cameras do fake raw and WB is not simply a metadata value, it is baked in in camera and gross shifts may be impossible to recover in post.
See Gerald Undone's great video on the topic