Why is caging so difficult?! Please Help!

No matter how diligent and careful I am creating a cage mesh, I consistently get errors that completely break the cage. I’m aware some of the errors arent anything to worry about, but some are. Including;
cage vertices intersect clothing
unnecessary cage edits
not water tight
outer cage extends too far
modified uv map
non manifold geometry
the number of cage vertices between the outer and inner cage dont match
‘Scene’ object has no attribute ‘checkResult_IntersectionInner’

There are very limited resources on how to cage. The only official resource is too simple: Caging Setup | Documentation - Roblox Creator Hub

Let me explain my process and please recommend what I can do differently!

I use blender. I am ONLY using sculpting, the inflate and flatten brush, shrink/flatten, and dragging vertices one by one. I do not use edge slide, scaling, extend, or any other tools. I dont apply any transformations.

Unless I am INCREDIBLY careful sculpting, I have to drag each and every vert one by one to create the outer cage. It takes 10 hours to make one outer cage accurately… How can I avoid messing up the outercage without dragging every last vert?

I find the hands and the armpits are areas that are impossible to cage correctly without clicking every single vert and dragging them exactly into place.

I would consider using the cage editing tool built into Studio if anyone can attest by it. It lags a lot for me and seems very primitive, but if it avoids all these errors that would be great.

EDIT: Even in doing so, whenever I change the hands on my outer cage, it messes up the uv map. I can even copy the UV map from an unmodifed outer cage and it still says “modified uv map”. Click every vert individually did not change this