Yes if its that good, and better than the MP as Thib suggests, then I'm sure Pavel would have put in the SFL.
For the record, I've never heard anyone say its that great of a lift, in fact I've only ever heard negativity in regards to this lift.
I respect Christians opinion though, he has experience and knowledge. Could he be over selling it? Perhaps.
Anyway, I will experiment with the lift myself and see what I think. Its good to hear some love for this one in here! Thanks to everyone who chimed in.
I think the reason this lift is so harshly criticized in our times is because of the poor movement capabilities of the modern day population. Slouched postures, too much benching, texting, working in office etc. The lift in itself can't really be called the culprit, but the lack of abilities to due it safely may say something about a lifter's limitation. I've had a torn labrum/pec and tendinosis of the infraspinatus and never had issues with it. Many Oly Lifters,, used it for mobility or, in Klokov's case, to rehab a shoulder injury. Bodybuilder's have used it for shoulder development and many powerlifters have used it up their bench strength, and possibly to develop better shoulder mobility for a better bar position in the squat, as mentioned by Pavel in Beyond Bodybuilding. Pavel also notes it as one of the primary movements of the Russian Powerlifting club and it is mentioned as an assistance lift option for the Press in "The Power to the People: Pro edition". Many strong lifters and bodybuilders have espoused it's use or have lifted monstrous amounts in the lift with no problem including the following:
Reg Park, John Grimek, Steve Reeves, Vince Gironda, Joseph Hise, Peary Rader, Arnold Schwarzenegger, Serge Nubret, Franco Columbo, Dave Draper, Bill Pearl, Chuck Sipes, David Paul (barbarian Brothers), Marvin Eder, Paul Anderson, Bill Starr, Yuri Vlasov, anatoly zhitetsky, Naim Suleymanoglu (jerk style), Dimitry Klokov, Donny Shankle, Ted Ardici, Pat Casey, Ed Coan, Steve Marjanian, Ronal Walker (oldtime) Bill Kazmaier, Ken Pantera (also weightlifter), Mark Felix, Mark Henry,
Coaches who advocate it's use: Pavel (referenced in BB, PTTP Pro and in previous forum posts), Charles A. Smith, Charles Poliquin, Christian Thibideau, Paul Carter.
As to address the original question as to why it's not included in the SFL, not to speak for Pavel but here are my guesses.
1)It's not exactly a foundational movement
2)For many the risk is not worth the reward.
While there are several other "key" or "assistance" movements not included, i.e. The Power Cleans/Box Squats/Romanian Deadlift/Olympic Squat vs Low Bar Power Squat, there are probably a few reasons for this. In a 3 day seminar, it is probably best to focus on a few key movements and their direct variations rather than several. Alas, I digress. I believe the BTN Press is a great variation if
1) You have a good reason to use it.
2) It causes you no issues
No exercise is irreplaceable or modifiable unless you compete in a sport which requires them. Just my incredibly lengthy and overanalytical thoughts.