You'd think so and you're kinda right but only when we update to the newest version. Witch farms suck balls at the moment and just give worse rates then stacking raid farms. In 1.21 witches go from like a chance for 0-5 redstone drops to always giving 4-11 redstone and raid farms are getting gutted so it will be useful then.
The claim system we are using should only go ten blocks down. I think it goes to build height upwards. If you want to know exactly what we are using here is it's wiki
https://github.com/Flemmli97/Flan/wiki
Claims auto disband after i think a month, You can change the time in the config.