I think it’s more complicated then just addressing over all grip.
Each tire has a function and ability which changes at different places around the track. It’s easy and basic to only deal with total kart grip. Total kart grip is not what defines the slow from the quick. The use and function of each tire at each place around the track is what defines the slow from the quick. Total kart grip is only useful to find a baseline.
Is the statement below true?
Turn entry speed is limited by the grip of the outside front tire. Yes the inside front tire provides grip, but if your on the limit and loose grip at the outside front your done anyway.