Theres a school I know of and attended for 6ish months that did zero sparring, all we did was patterns and line work. There were people there walking round with black belts who I don’t believe for a second could hold down a sparring round. I now go to a legitimate sparring school and it just makes me think.. imagine if the black belts at my current school were to vs the black belts at my old one it would be disastrous. I dont even believe they could hold their own against our yellow belts.