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Full range of motion is not automatically better. It’s exercise specific.
Some movements really respond to stretch-mediated hypertrophy. Calves and hamstrings are the obvious examples.
Other exercises shift emphasis across the range. When you press, the end range is primarily triceps. The bottom range is primarily chest and shoulders. So training one portion may build more of that specific muscle, while training the full range gives all of them stimulus.
Then there are exercises where you can’t isolate anything. On a lateral raise, the trap and the lateral delt work in unison whether you like it or not.
Full range also means you experience the entire strength curve. More muscles get stimulus, the resistance path is longer, and you’ll usually use lighter weight because of it. Some exercises are simply harder in one portion than the other. Hip thrust at the end range. Pulldown at the bottom.
Perhaps the biggest advantage of full range of motion is mobility. Most people don’t have time to strength train and do dedicated mobility work. Training through a full range lets you accomplish both at the same time.
