Just because a new expert says something is better isn't a reason IMO. There's been debate on this for years. You probably know that the British press were all over one of the early tennis "screamers." Can't remember who she was... But they were relentless. So she decided to be silent for that tournament, and lost. She absolutely sucked. At that point she decided not to listen to others, and do what her body seemed comfortable doing. And wouldn't you know that - with her screaming - she began to do well again. The press soon left her alone when they saw the difference, and other players began vocalizing.
I would however recommend folks practice the Goju version of Sanchin. It's different... Van once noted during Dave Finkelstein's test that he was breathing out at various points in his kata. That's because he started in Goju. That dynamic tension, breathing kata will teach you ANOTHER way to breathe. Better yet, it taught me not to breathe the same way for every damn thing you do, like I see some folks do who try to incorporate "expert" breathing methods. It makes me want to rip my hair out, because it's clear they are "wearing" rather than "owning" their breathing.
FWIW, Goju Sanchin will teach you various INHALING techniques (plural) as well. There's no sin against experimenting with it. Nobody died from doing Goju. Far from it... Some of the best warriors I know did Okinawan Goju.
I'm not a big fan of the red-in-the-face Sanchins done by some. That's not good exercise IMO.
BTW, one of the benefits of "sniffing" your inhales (when you want or need to) is that it increases venous return. That in turn will give you a bolus of blood to squeeze out of your vena cava on your next restricted exhale.
One more thought... I personally don't like mouth restrictions (per Don Smith's description above). There's really nothing terribly wrong with it. It works... I just prefer not to do it because it causes a lot of spitting in the dojo, and can dry your mouth out. My restriction comes way back from my epiglottis. Listen to your house cat when (s)he hisses. That's what I do. I learned it in my very first kata (Teisha 1) which ended in cat-like motions and a belly-driven throat hiss. It moves me...

- Bill