It's not a serious problem I have, just saying I like OpenSCAD, I have been able to generate every shape I've ever needed to create, and it would do everything I want if it was possible to generate true curves (because I farm out the manufacturing).

Do you have a sample DXF (which uses arcs) which describes a lathe project?

I dug up an OpenSCAD from some backups if that's interesting to you https://pastebin.com/xwhrLwQH

I do not have any DXF of something like this.