Apparently this happens only if you set the laptop to discrete GPU only mode, which most people won't do.
However, this is not the only problem with Asus bioses. My daughter has one and it randomly locks up if you add an extra SSD, sooner or later depending on the SSD. You'll blame the SSD's firmware, but the most locking one was one that I have in two desktops with no problems...
This makes sense, but what does not make sense is who tested this 'ultimate mode', I mean they went to the trouble of adding a physical hardware switch on the motherboard for this, surely when testing there was some kind of benchmark or comparison to show this feature was an advantage. Maybe they don't test, or they have 'internal firmware' that is not what the user gets, but it's a serious fail either way.