Plenty of men around 60kg in South East Asia, South America, Central America etc, and remember we are talking about lean athletes here, not guys carrying 20kg of excess weight. There are plenty. Thousands.
Think of all the little clubs in Mexico, thousands of lightweights learning their craft, replicate that in the Phillipines, Japan etc. Think of a lad from Birmingham starting at a club, starting to spar, being good enough to even be allowed to compete in a novice bout, to win a novice bout, to win enough to fight as a senior amateur, to win as a senior, to maybe, if he is one of the very best in the country be called up to the GB set up. To go to Sheffield and full time learn his craft and perhaps be picked to represent them in an international tournament, to beat international opponents, to maybe qualify for a championship, to win a championship and so on and so on - and that's before he has even become a professional.
Elite boxers are as elite as anyone. But yes, the 1000th best boxer in a weight class wouldn't be as good as the 1000th best footballer, of course not. But on the other hand, only a handful of boxers are considered elite, yet there are 1000s of positions available as a top class footballer.
As for Lomachencko, I'm not sure what you'd consider 'that good' if you don't consider him that good. His skillset is phenomenal.
Anyway, I do think you have a vague point if we think of heavyweights, and think of getting to a certain level. But getting to the point of being a truly elite fighter, no, you've taken it too far IMO.