>>390814767
This desu.
Long time CATs user ever since it first came out and while most of its functions are pretty redundant now due to them being focused at MMD conversion it still has useful features like the ones mentioned here.
The problem lies with people clicking buttons and not knowing what they do, for that reason I never recommend CATs to people new to Blender. People new to it should learn how to do things manually before using shortcuts that they don't know what they do and end up accidentally breaking things.