>> Not working out your shoulders will likely lead to injuries in future years of lifting.
I disagree with this statement. I haven't heard of any shoulder injuries due to not doing an isolated shoulder workout. Or have i had any problems in the past with moving heavy chest or back weight.
Well you can disagree, but it's a true statement. Back in my early years of lifting when I first started I had the same attitude about shoulders that you have. I felt my shoulders were sore after my chest and back workouts so I decided they were already being hit and didn't need anymore abuse from me. How wrong I was.
I ended up damaging my rotator cuff from months of abusing my shoulders. Increasing weight on my chest and back but not building up my shoulders tore them apart. Basically, it got so bad I could not press 15lbs above my head. My sports dr. informed me (as well as the physical therapist who helped me recuperate), that my shoulders were underdeveloped for the weight I was lifting. If you don't want to hit your shoulders that's fine.. to each his own. But for those of you reading this thread, I HIGHLY recommend hitting your shoulders and giving them their own workout.
Now back to inexperience. Like I said, when I did my chest and back workouts back in my early years my shoulders were often sore. This was because of 2 things. The first was because they were underdeveloped and I was putting a lot of stress on them during my back and chest workouts. The second, and most important, was that I was lifting incorrectly. I won't get into this here because I'd have to see your workout to before saying if you're lifting correctly or not... but if your shoulders are sore after a chest workout, you are lifting incorrectly.
A buddy of mine made a comment last week that reminded me of this thread. He said "It doesn't matter how much protein you eat, it's all about calories. You can eat nothing but fat and still gain just as much muscle as a high protein diet." In theory that sounds correct... as calories do determine whether we will gain or lose weight. But we also know that the breakdown of your calories consumed is extremely important to optimize muscle growth (protein/carbs/fats).
Same goes with working out your shoulders. If you want to believe that not dedicating a workout to your shoulders will lead to muscle growth then you can... and you will most likely make
some gains in the course of a year just from working out other body parts. But the fact is, you
need to workout your shoulders just like every other muscle in your body to see the greatest gains and to help combat future injuries.