When i just started lifting, i did guillotine presses for chest, but it worked my shoulders more than my chest.
i did a lot of research about lifting, i always end up getting more confused, there's always different theories advocated by different reputable trainees that has good results to show for, nearly all of them has good scientific basis in being the "best" way. HIT, GHVT, HST, 5x5, 3x5, high rep, different splits, full body, upper lower, push pull, different frequency 3 day, 5 day, 2 day a week. Too many factors like recovery rate, diet, rate of protein synthesis, hormonal response, different forms stimulating different muscles in different intensity.
that's why i think at the end, it's really up to self-experimenting and to find out what's best for you, there's no universal method in getting the most gains, only some basic principles like, progressive overloading, below 90 sec TOT for hypertrophy, weight gains = calories in vs calorie out. but even in those principles there's many variables, such as the poundage increase can be more of a neurological adaptation rather than a muscle growth.
regarding in lifting techniques and form, people are built differently, yeah there might be studies out there showing the best exercise for maximum muscular activation using EMS, but the population that participated in those studies aren't large enough to represent all of us, there is simply too many variables to draw any absolute conclusion about the human body. That's why like most bodybuilders, kai greene, jay cutler, their forms are sometimes weird, a lot of times we see them doing partial reps, bodybuilding isn't so much about the lifting technique, it's about muscular stimulation, mind muscle connection, if jerking only a few inches in the bench press allows you to feel like you have your chest muscles fully working, then to me it's fine, given that the form won't cause any injuries.
sorry it's a little long

Agreed. It ain't long at all. I read it all.