You can as well compete or train below super heavy weight, stay fairly lean and lift heavy.
It's likely Steffi Cohen and her 56kgs lean outlifts most posters in the Health and Sports forum here, you can become very strong while still lean (like Cyplenkov). Strongman also has several weight categories but most of the publicity and money is in the open weight category, so getting huge seems the way to go for aspiring professional strongmen. Not all are as fat as Shaw either.
You can check below all current record holders in IPF ( a drug tested federation, as of January 2018 ) below 105kgs athletes are fairly lean. It's similar in untested feds but with mostly bigger numbers - and possibly leaner athletes, particularly Larry Wheels.
The most popular powerlifter at the moment is Larry Wheels, a 24 y o multiple record holders @125k, always very lean, who also won his first Bodybuilding contest, before recently switching to Strongman, where there seems to be more money. Being so strong and lean is more the exception than the rules, but there are plenty of pretty lean strength athletes around 100k. They usually need to control their BF to stay competitive in their weight class.
I don't get the motivation of the guys at the gym working on cables and smith machines, lean but also skinny and here at least weak, training seems very boring to me, and the end product very unimpressive.
I wouldn't say the same about massive bodybuilders as some of them are quite strong but have absolutely no interest in bodybuilding competitions, it looks like a gay gogo bar show down in Bangkok.
Besides you also have the option to try and emulate competitive CrossFit or Calisthenics athletes if you care much about strength and leanness, those guys are monsters in higher rep ranges with lean and muscular bodies.
Saying getting strong is for fatsos sounds a bit like a cop out, obviously you won't squat 900lbs@183 but can still move serious weight and work out in that direction - i used to weigh exactly this @30 when lifting about the same weights as now

but now definitely prefer the over 220 look.