Honestly, I don't think there's any such thing as a "true" no-limits slave. What people do who want that kind of relationship is find a compatible partner whose kinks and limits pretty much match their own before committing to them, and after a sufficient level of trust has been established, limits don't matter so much anymore. I think the terminology is a little off, but that's nothing new when you're looking for a succint way to say something and get your point across, i.e. using the word "switch" instead of "a sub who likes to top on occasion." Switch is okay to use, although as with anything else it may require further explanation because there are different kinds of switches....and different kinds of submissives.....and different kinds of slaves....etc.

It just seems a bit ridiculous, to me, to answer someone with a paragraph-long description, like "I'm submissive to my significant other with whom I engage in consensual nonconsent but also a sadomasochist who enjoys topping others outside of my primary relationship." I suppose I could copy and paste this.....