From my understanding most strength gains are neurological. You get stronger basically by neurologically recruiting motor units within the muscle cell. A motor unit is a nerve and the muscle fiber it innervates. If I remember correctly. As you lift weights your CNS is stimulated to recruit a necessary amount of motor units, depending on percentage of weight lifted and/or how close to failure you go. As you increase weight, reps, mechanical stress, your CNS adapts by recruiting additional motor units (muscle fibers). Muscle fibers get thicker and denser. This is hypertrophy and it's kinda like a side effect of this process. Hyperplasia is totally different then hypertrophy in that you actually increase the number of muscle fibers.
Strength gains definitely occur as a result of both.of these but nothing in comparison to neurological adaptations. Not to mention the difference in types of hypertrophy.
This is a very broad topic and something that ive studied and have been very passionate about most of my life. So interesting.
The human body's ability to adapt and grow or develop is incredible. I believe there is so much power and possibilities that we have yet to tap into.
Sent from a place you don't know.