most talked about boxer ending his career with less than 15 fights

[Primo Carnera]

Vasyl Lomachenko and Artur Beterbiev

They're just getting started, hopefully.

Man Beterbiev is scary good so early in his career.

That's true, but my point is that Beterbiev is 31yrs old and had 9 fights , Lomachenko is 28 and had 6 pro fights.
At the rate that people fight nowadays, both of them will struggle to get past 15 pro fights.
I fully appreciate that they both had stellar amateur careers and should both live up to their promise in the pro ranks, although they won't have many fights.