Delete Styles

In Styles setup there isn't an option to delete a style. I'm guessing this is a safety measure? Can it be done by request?

It can, but only about custom style's you've added. The initial 10 styles of RTD still needs to stay there.
It's something we simply never faced as no one ever asked for that.

Until ME of course. In that case the best thing is to clone new styles to the descending styles starting at top and push the undesirables to the bottom. That will work.