Nope, still very much among the viable options...https://www.rideformula.com/products/mtb-brakes/cura/Pretty sure Formula abandon it, unless they brought it back. Initially was one of the reasons that drew me but in the end they stopped when I bought my Curas.
...or any internally routed frame. Kidding aside, my Fugitive internal routing has a peculiar rear brake hose path that makes the bleeding a PIA, this would allow me to bleed the system off the bike and then install it back on, easy peasy.There isn't an advantage running one on anything other than a Tri bike or Road bike with an integrated front end.
The fitting goes on the brake lever, the hose side is the same diameter of the hose itself.Not exactly. That fitting is larger than the holes in the frame so you'd still need to install it after the hose is routed. Unless you have a frame with the rubber grommet things and then it might work.
As an example of where this would be phenomenal. Both of the hydro hoses go through the upper headset bearing on my Tarmac so to replace it, I have to run 2 new hoses because they're isn't enough slack to cut the barb/olive and reattach. It's a $300 job for a $30 bearing that lasts 6 months. Yay bikes.