Genetics is a vague term that can be applied to various scenarios accurately. There is structural genetics which is about how your muscles look, insert, attach, etc... It can also be used when discussing the fascia thickness/tightness. Muscles with a more flexible fascia will grow more easily.
There is the genetics of chemical response as well. Some people respond to chemical enhancement much better than others. Look at Levrone that simply blew up to Mr O competition shape in three months after ditching the gym for his music the other nine months.
There is also stimulus response as well that is a genetic trait. This is in regards to how easily the body responds to training and such. Some people can train like a mofo and eat good and simply never make progress. Others can half ass train and use no drugs and still look amazing.
There are other aspects that fall under the genetics umbrella as well. Your metabolism is one. Not only how much food you can eat but how much you can utilize. A lot of people do not realize you have to train your body from a nutritional stand point just like you train it in the gym. You take a look at how much food the top amateurs and pros eat and if you take the average person, stick them on a diet like that, they would get very fat very fast, even from all clean food. You didn't bench 315 the first time you walked in a gym did you (at least without help and a strain on the body), well you are not going to go from eating 1500 calories a day to eating 5000 a day over night and not suffer for it in some kind of way. You got to train your body to be accustomed to that.
Recovery is also a genetic trait that is predetermined. Your CNS recovers at a different rate from other peoples. You have to work with that recovery rate, not against it.
So in a nutshell, yes genetics matter. But when you get right down to it, genetics are really a fucking crap shoot as to what your parents and Mother Nature are going to give you to work with.
Great post.
You can take many drugs like aas,thyroid, slin, etc to overcome genetic faults but make yourself sick in the end. That could also go under drug response but the fact is genetics is everything in your dna.
Some people have it, some don't but there will always be drug dealers trying to push drugs...