I've been thinking about getting a mill and a metal lathe, and I'm trying to sort out whether it's a reasonable idea or just a symptom of tool acquisition syndrome.

I've got a little unimat lathe that I picked up cheap off FB marketplace recently, but I haven't used it yet.

Some questions:
1. For those who use machines in their shop, what are the most common tasks related to double guns?
2. Is a benchtop/mini mill or lathe useful (as opposed to a Bridgeport and a full size lathe)?
3. Any other thoughts on machines in the amateur gunsmith's shop?