is "8-12" not "few" for you?

Steroid use has been shown to increase muscle in untrained males by around 25-30% I believe, without adding any exercise. That doesn't accomplish too much. If you want any worthwhile results, you will still have to train, although the steroids produce significantly more results for the same investment.

My understanding is that anabolic steroid are somehow close to what you're thinking about? It's just that as anything taking a simple shortcut , it comes with unwanted effects

The reason no one has found a better way is because hypertrophy is because it’s well understood and there’s no “better” solution. mTOR is the primary hormone pathway.thy increase the adaptation ceiling by increasing RBC, reducing protein breakdown, etc. Thereby reducing rest needed, so mTOR is heavily unregulated.

This is one of the view places where “if we could we would” is the correct answer. There is so much money in the space of anabolic cheating, the clandestine scientists would’ve already developed it.

This. Muscles can be optimized for volume/endurance or power, or some balance between them. Taking legs as an example: Powerlifters obviously go for pure power, whereas runners need a bit of power but mostly endurance, whereas cyclists need more power than runners but more endurance than powerlifters.

All of these benefit from weight training, but depending on the sport, the programming will be very different.

There is a minimum weight you must use to create a training stimulus, but yes, you can increase your 1RM with higher-rep sets (again, to a limit, they can't be sets of 100, the weight is too light).

To increase your 1RM at the most optimal pace, yes you need to specifically train the movement so that you can benefit from improved technique and neurological adaptation. But if I do tricep, pec, and front delt isolation exercises at higher reps, to failure, and see significant hypertrophy in these muscles, my bench press will be stronger, other things constant.

Right, but this post is about hypertrophy (big muscles). Not about heavy lifts.