'Twas me who said that, and I stand by the comment. But there are a couple subtleties in that comment you missed:
It's not that I "don't recommend Billy Goats." In fact, I got rid of my Rens and kept the BGs when I moved to Baltimore. In particular, I was responding to a poster who wanted to ski the BG inbounds and the Ren for touring. You just don't get that many runs in the bc, and I personally wouldn't feel confident standing at the top of a big face with the Rens on my feet coming from many days on the BG inbounds. YMMV. I'd rather ski the Rens inbounds and tour on carbon Kusalas, if I were going that route. The Ren just requires you to be on the balls of your feet, while (my pair of) BGs require a forward, driving stance. IME, the two don't play well together. But there are times on the BGs that I wish I had the Rens, and vice versa and I could certainly see owning both if I was still skiing 60-80+ days a year.
One more thing: I just came to understand that my BGs flex ~20% stiffer than stock and are nontrivially more "planky" in feel, so maybe it won't be as big of an issue on the stock BG. The GPO is retardedly easy to ski by comparison—it's fine with a neutral stance. I'd guess transitioning between the Ren and GPO is fine (as was confirmed above).
What specifically do you want this other ski for? Narrower/more versatile? Lighter for touring?