No actually, dumbbell press works the chest more than barbell. Also some people respond better to decline than flat. Some people just need a wider grip.
Yes, EMG studies show that Decline DB Presses stimulate the chest more than a BB press.
Laterals and posterior? What does that have to do with someones anteriors doing to much of the work during bench press?
I think you missed my point. The point is, you often see bench jockeys relying on compound movements that they love such as the benchpress which causes the anterior delts to explode, and then they ignore lagging parts such as lateral delts which can not be brought up with compound movements.
Lateral raises worked great for me. If I ever do isolate posterior, I use the rear delt row.
I like the rear delt row, but I prefer the bent lateral. Both of which are isolation moves and not compound moves.
But really they get worked just fine with the rest of my back.
Then you’re lucky. I work my back with heavier weights than my chest, and my posterior delts still lag. Maybe its different for everyone, but I’m one of the guys that needs extra posterior delt work.
For rounding out and working on ratios, you do need a lot more isolation because you have to work some things a lot and some hardly at all. You still don't need to rely on machines so much.
Actually, I don’t use machines any more since I work out at home now. But I do appreciate the perks a machine offers such as the ability to safely self spot, forced reps, eccentric work, etc. Machines are just one of the many valid tools you can use.