My opinion, if you're going to wear a chastity device like a cage, you should be freshly shaved. Number of reasons for this.
Practical reasons. It's easier to put on if you don't have to fight a bunch of hair especially with me as I barely fit in as it is and it's a bit of work to put the cage on correctly and get it secured.
Hygiene, I just think it's overall easier to stay clean and fresh without the hair kaising an added complication.
Visually, I think it looks better, sexier, raunchier or however you want to think about it when there's no hair partially camouflaging. Camouflaging the cage is just smooth skin and the cage is very prominent visually.
I also think having your balls fully shaved when you're in the chastity and they get full look visually much better.
Having the smooth feel both around the cage and on the testicles I think is pretty sexy.
Mentally and attitude wise It helps with the submissive state, You're basically shaved and neutered.
If you happen to be in a situation where other people are going to see it, Beach, pool, jacuzzi, gym shower or whatever. You're definitely in a less manly statement than if you had a giant bush and you could barely see the tip of the cage sticking out.
Just my thoughts on the topic.