While I totally agree that it is physically unrealistic to maintain the "shirtless scene-ready" body all the time, it is also worth mentioning, in my opinion, that most people can still look fit and strong. There's a fine line between expecting to look like movie superheroes all the time, and blaming it on extreme diet/workouts and calling it totally unachievable.
We may think so in this age of fast food, junk, sedentary lifestyle with little physical struggle, but the human body was meant to be fit. Tell native american hunters that having a strong, fast body was unrealistic. Their lives depended on it. I'd say even in today's world, soldiers and other military personnel depend on having a very fit, strong body. And the aesthetics are just a sweet bonus to having such functional, muscular physiques.
Just wanted to put it out there. I find it rather annoying that people say things like how great bodies are totally unrealistic haha. Sure, being totally jacked, vasucular, and having abs that pop out all the time is unrealistic, but with dedication, discipline, and effort to rigorously workout 3-4 times a week and eat the right foods, anyone can look good without a shirt, or at least fill out their shirt better

I haven't even begun to mention the vast health/medical/lifestyle benefits of having a healthy, strong body.