Not for mass, for mass you just need calories. Most builders trying to gain mass don’t give a shit about what they are stuffing their faces with just so long as it lines up with what ever they have calculated to be their ideal macro ratio and calorie intake, whether that be home cooking or Mickey D’s . If you are trying to gain mass you have to gain weight, and you don’t get to choose whether that weight is fat or muscle no matter how hard you are working out. The hope is that with that weight gain and a work out that focuses on hypertrophy, some of that weight is muscle. (A lot of it will be fat though, you can’t just gain pure muscle). After this, they will usually go through a cutting cycle to get rid of all the fat gained, by significantly lowering caloric intake, but keeping protein intake high to prevent the body from going into a catabolic state, and eating the muscle gained. At the end of this cycle, a natural body builder would be lucky if they have even gained 5lbs of pure muscle in a year of doing this. And the gains are smaller and smaller after. That’s where Our friends AAS’s come in hand. That’s why next time you read about some Hollywood schmuck gaining 25lbs of pure muscle in 6 months to play some marvel character, you can almost guarantee they’re using gear. Even with the best of genetics, it’s just not possible to do that naturally.
The studies in protein consumption have been ongoing with the consensus being about .8g for every 1lb of body weight, but that all depends on what you are trying to achieve. For people not trying to go all in and just improve their physique a little, it can be relaxed a bit.