fair point
as an example, Brad Pitt at 1.8. m was 70kg in fight club. And that is really good form for a guy. Maybe add a couple more kgs of muscle you can not be more than 75kg at that height, and that only if you are super muscular
Being super lean is very important for improving your attractiveness
even girls, if she is 1.70 her ideal weight is somewhere between 50 and 58 kgs. Over 60 kg she starts being a bit fat and over 65kg she is fat
unless she is an athlete and has big muscles, but in the vast majority of cases that is not the case
you can go bigger, like Christian bale in American psycho or Batman begins, but that guy was full of muscles and never weighted more than 85kgs at 1.83. But you have to have a really healthy and train all the time
To keep that physique
but as an idea if you are for example 1.80 m and have more than 70kg, unless you are muscular, it means that you are going more and more on being fat
The vary vast majority of people we find hot, are also skinny / very in shape
Rarely we see people who are a bit overweight or overweight to be considered hot
maybe a guy going for the lumberjack style, bulky and a bit chubby but in shape. But I doubt this is something that will be appreciated on a big scale. Maybe in more rural / small cities type of settings