The view came from the internet and TV. An example would be Mayweather (on TV) punching the air with light dumbbells instead of doing direct shoulder training, bodybuilding style. Even if bodybuilding is not Mayweather's goal, bodybuilding-style training with a modification to suit his purpose (shoulder endurance) would be ultimately more superior than punching the air with light dumbbells.
Another one would be a certain fighter I saw on TV too. He was an amateur but was competitive. It was an episode in some MMA show that I forgot the title of. He was doing "backyard training" with push ups. There's nothing wrong with push ups, but he was doing it in the following way: There were two dumbbells on the floor. He knelt down and held both dumbbells (the dumbbells weren't round. They had a straight surface, making them "stick" to the ground.) with his hands and began doing push ups that way. All well and good, but every time he pushed his body up, he'd do a row (a pulling movement), pulling one dumbbell up, and then doing a push up again. He alternated which of the two dumbbells he'd lift every time he pushed himself up (nothing wrong with that). I've seen that done in a gym before and I think it's a stupid exercise. I can elaborate why I think that if you want me to.
Another one was Anderson Silva doing ballistic (explosive/speed-oriented) bench presses with a Smith machine barbell while lying on the floor. A stupid and pointless exercise as well. I can elaborate why if you want me to.
Another one would be Rich "Ace" Franklin (or someone close, I'm not 100% if it was really him.) doing circuit training. Circuit training sucks. I used to train my mother in an apartment gym with circuits, and looking back, I can honestly say I'm ashamed of what I did. I could've done a better job and just made her do straight sets.
And then you get the countless martial artists all over the world who absolutely renounce lifting weights, saying stupid **** like "It'll make you slow" or "It'll make you less flexible" (the latter has a grain of truth to it. But JUST A GRAIN.).
And lastly, this video...
Beijing 2008 Martial Arts Training Camp: SHUAI JIAO SPECIAL
(There's some good stuff in that video, but the one I want to point out are the exercises these martial artists were doing that involved those cement weights and that light barbell. I can think of a million other ways to give you a better, more strengthening workout. Workouts that will benefit your martial arts,)
As for shoulders and how they apply to fighting or boxing, what would you say is the boxing exercise that most builds the shoulders? I ask because there is a specificity to exercises - as how they actually apply to high level fighting.
If I were to debate you on the proper ways, form, diet, benefits, rest periods yada yada of heavy squats based on what I've see on TV and the internet, but never actually did them myself, you would reply.....?
And, if you put even a tenth of the effort developing social skills as you have squatting, you would be rewarded in ways you aren't even aware of yet.