We've been actively poly for 10 years, and our triad is in its 4th year and working fine. Of course there are people on this forum that will tell you that some particular configurations will not, or should not work.
Oh please. That is false. Don't start that. You're talking about unicorn hunting. Nobody ever says triads won't or shouldn't work. People say unicorn hunting is unrealistic. Those are not the same thing. Don't go around saying shit that isn't true, please. Do your homework, then come back and have a discussion that makes sense.
That is all.