Yeah, at first I tried enabling history on everything by default. But several things such as copy and mirror could have pretty surprising results. So I couldn't really turn it on for everything by default.

But I thought that I would turn it on by default for these commands: Extrude, Revolve, Rail Revolve, Sweep, Blend, Offset curve, Planar curve, and Loft.

These seem to be ones where a lot of people are expecting history to work on, so I wanted to make it work automatically here, instead of having to manually turn it on for these.

It can still be a bit surprising if you're not thinking about it when you move the original curves around, though.

- Michael