At ATT, at my school at least, if you want to fight MMA, you train no gi. You train striking. You mix the two. Many jiu-jitsu techniques are shed. Guard passing becomes secondary to elbows and hammer fists. Work on your takedowns and defenses. In other words, if you are thinking of MMA, stop doing jiu-jitsu, and do MMA. Simple as that.
As per self-defense and or street fighting, the best thing you can train in is parkour. Learn to run, learn to vault over obstacles. Live. To speculate about possible self-defense scenarios is a fool's errand. We can speak to our own street/school fight and self-defense experience. As an adult, I was attacked once, and, in fact, I used one of the self-defense techniques I learned at my first jiu-jitsu schools, Relson Gracie in New York. It was late October, he was wearing clothes, grabbing him actually helped.
I am educated enough to know that in a no-rules scenario, personal experience only carries theory so far. MMA has specific rules and so one can theorize properly because we have matches we can analyze.
It's devastatingly unintelligent for us to do a gi vs no-gi argument based on self-defense. One side will say, I saw a video where a dude did a perfect morote seoi nage (two hand shoulder throw) grabbing solely a t-shirt; while the other will say, I saw a t-shirt rip quickly.
The truth is we are not training for the streets. We are doing a martial art, but it is not, in any way, a dress rehearsal. Our art teaches us to think on the spot of being attacked, to be creative, to know how to control, where we need to be in relation to our opponent. Bare-hand, any jiu-jitsu trained martial artists wins (gi, nogi, mixed gi, pants only, turkish oil wrestling, no matter, wins).
Add a knife to the attack or a group of his friends, then you do parkour. At that stage, it would be more beneficial to have trained the "FLIGHT" response. Run. Live. Add a gun, pray, cower, face death stoically, whatever. Or pack your own heat, which then means, your jiu-jitsu training is really not for self-defense because you are carrying a permitted weapon all the time.
My initial impetus in starting this post, as I said, was not to do the gi vs nogi thing. It was to actually inquire as to what things training in a gi gives people that nogi folk see as advantageous. It wasn't meant to bash any one style. And I did not do that.
In other words, I was really inquiring how 10th Planet folk see Ronins like me, who have no school near us, 6 hours at a minimum, but are nonetheless appreciative of Eddie Bravo's brilliant and revolutionary contribution to jiu-jitsu. I hope you understand we Ronins are not flawed BJJers in your eyes because we spend part of our time in gi. As a Ronin, I admire you all, am even a little envious; but I am also level-headed enough to understand that jiu-jitsu is its own thing for its own sake, much like other sports are. That, we enjoy doing all forms of jiu-jitsu as a sport, gi and nogi, that has arbitrary rules like any other sports, which include the type of attire one is allowed to wear and what one is allowed to do with said attire. (In football, you cannot grab a face mask, etc.)
I caution the quick "analogical" move we make with jiu-jitsu sometimes, whereby the value of it somehow exits outside of it, in a hypothetical encounter in the street, or in an encounter in the cage, where it becomes another sport, with it's own arbitrary rules and attire, disallowing the grabbing of clothing and gloves, and where the ground game is discouraged and given lesser value in the judges scorecard than the striking portion of the MMA match.
Jiu-jitsu does not need MMA; nor does it need the street to be valuable. It is valuable on its own, a beautiful sport that we fall in love and addiction with, and in which the grand, very grand majority of us, will never be able to translate it onto the pavement or the MMA canvas.
Be well, and thank you for being an incredibly open-minded forum. I know this group gets unnecessary and undeserved grief many times from other BJJers, and your founder, Eddie, has endured way more than any of us would be able to for the sake of our art. But it is in this, in Eddie's vision, his willingness to share it and publicly test it, and welcome all, that 10th Planet's vision will be fulfilled. Things like this take time, and you all are lucky to be at your schools, but you should know many of us who were silent advocates and allies are now openly defending and advocating the 10th Planet revolution in the world of jiu-jitsu.
We just wear the gi, partly because we have to, and partly because we like grappling in it.