gaining muscle is very hardYeah, exactly, just like everyone else on the planet. That's how it works.
If you want to gain muscle, you obviously need to feed your body.
If you want to lose fat by starving yourself, sooner or later your body will have no choice but to stop attacking fat and break down muscle because the proper nutrients aren't coming in with such large calorie deficits.
You can trim body fat with minimal muscle loss, but it is very temporary and requires some control.
Simply telling people "STARVE YOURSELF!, EAT WHEN YOURE HUNGRY, BUT NOT WHEN YOU FEEL FULL!" That's bro-science.
losing muscle is equally hard
gaining fat is very easy so that analogy is silly
stop listening to bro science nonsense. Measure your bodyfat percentage and muscle mass amount scientifically before and after a hardcore cutting cycle. You will see that you lost no true lean body mass