The issue is woman would disappear from profesional sports. Sinners 16.27 rating means that he double bagels Sabalenkas 13.29 essentially 100% of the time. The 500th ATP player has a UTR of 13.81, half a point is quite a bit stronger, do he's still very much stronger than Sabalenka. You probably have to start looking well into the thousand somethings for something that is consisently beaten by her.
Only the top 200 players make money, the top 100 good money, and the top 50 ridiculous money.
UTR can also include unranked games if one of the players submits a score and the other approves it.