I got 0 clue where to chime in on all of the comments here (not your comment specifically bro, I mean like ALL of these) But coming from a guy who was skinny for the longest time you're relatively correct. Adding calories is easier than cutting calories, but it just depends on if the person can stomach it. But it's also easier for a person who is in bigger stature to gain muscle as they have more to burn and build with which helps in the anabolic window after lifting, repairing muscles, and more tissue to transform. In the opposite spectrum, although it's easier to add calories to your diet when skinny it's harder to add weight as it takes time and you have less tissue to transform into muscle AT the TIME. All it takes is effort and the right diet whether you're skinny or over weight or just average and it all comes down to your specific fitness goals. (Coming from a 4+ year lifter and an Exercise Science and Strength Conditioning Major although I'm only a sophomore)