Apparently. The fact that you can't run a third party graphics card without disabling it is pretty ludicrous, though.
Many people do not use SIP.
Do you have statistics? My perception is the opposite.
Not directly, but anyone with a Hackintosh (modified PC running Mac OS) must have it disabled, and a fair number of pro users disable it for various purposes.
JFYI you can have SIP enabled on a hackintosh if you use clover to inject kexts.
only occurs on non-sip macs
Right, because SIP is working as intended.
Without SIP this would have been caught in testing
which means they tested inadequately, as they only tested with SIP enabled, but not with SIP disabled ?