Alright, I give it one more go with you.
Exercising a joint through it’s entire, or majority of, ROM, specifically the glenohumeral joint in the bench press, is the most optimal method for strengthening the soft/connective tissues which are responsible for articulating the joint throughout its entire ROM.
By limiting the ROM ON ALL MAX EFFORT training you predispose the glenohumeral joint, and its respecitive connective tissues, to injury when subjected to high stress/force in a deeply extended/transversely extended shoulder position, which by the way is a position which athletes will find themselves in if they participate in MMA, football, rugby, hockey, throws, wrestling, powerlifting, OL weightlifting, and the list goes on and on…
Again, as part of a rotation of special exercises I am a proponent of partial range bench pressing (eg floor press, board press, pin press, etc). HOWEVER, as a sole means of max effort attempts, the partial range press would ONLY BE SUITABLE for a lifter or athlete who suffers from a particular pathology that inhibits full ROM about the glenohumeral joint in a supine position.
So, infact, your attempt to prohibit injury will more than likely INCREASE the probability for incurring a future injury.
Blinky, I don’t know your history, but I have been lifting for 16 years, and counting, as well as working with various types of athletes of varying abilities. The individuals, and sources which I reference, as well as my own experiences, all support the view of exercising joints through their entire range of motion and, so long as pre-existing/current injury/pathology is not a factor, and to utilize maximum loads specifically with barbell lifts, either within the parameters of percentaged based training or concurrent/conjugate methodology in which max loads are lifted on a weekly basis by way of the rotation of special exercises (some full ROM, some partial ROM).
With respect to a Cost:Benefit, the ONLY COST OF FULL ROM BENCH PRESSING WITH MAX LOADS is if the trainee is battling/suffering from a specific injury/pathology of the glenohumeral joint.
Your exclusion of heavy full ROM bench pressing will more than likely greatly increase the probability of incurring future injury to the exact joint in which you are trying to protect.