I wouldn't doubt this for front/rear derailleur use, but for braking I'm not sure. It has many advantages. Difference for derailleurs will be that a failure won't cause an accident. Braking may, though the front gives the redundancy one hopefully isn't not needing.

What forces (quantities) are you taking into considering for making this recommendation ?

Brazing is a minimum of some 15 times stronger (jb @ 4kpsi ), although the surface area used will be much smaller. JB weld can be brittle and break off - I'm not sure how it's going to stand up to temperature change, bumps, surface liquids, UV, etc. JB weld is not as easy to know if you've applied it perfectly well enough. One advantage with the JB weld though is that you could easily come up onto the sides of the cable stop and get a good 5x surface area increase.

Of course some empirical experience would be nice to hear for front/rear derailleur and brakes.