Definitely a valid point.
Also, you can select the Regular Expression Unicode Properties item in Keyboard Maestro’s Help menu to take you to this ICU Unicode Properties for Regular Expressions page that I created that will show you what characters are included in each character class (it’s not live updated, so it is always possible some have changed, but it was right at the time I made it).
So \p{Lower} is at Characters matching \p{Lowercase}