I support any leaderboard that rewards the best players while also encouraging activity in sparring. The old leaderboard was awful because of glitch abuse and camping. The new leaderboard is bad because it is seasonal. It needed to be daily/weekly/seasonal.
Making the spar leaderboard an all-time wins leaderboard achieves neither. It does not reflect any measure of skill and it does not encourage activity. It does the opposite. It discourages people from sparring actively because they know they will never have a chance at passing Shan or Sarah, and it does not reward the best players because beating a great sparrer is effectively the exact same as beating a complete noob.