You can't compare esports (although WoW raiding is hardly an esport) to sports.
RL games rarely change, rules and what one needs to do are the same for decades or in some cases hundreds of years, whereas in case of WoW mechanical difficulty of raids raised quite dramatically over the last decade.
As blues recently stated:
Originally Posted by Blizzard Entertainment
Professional raiding as well as raid design have evolved a ton since those days, they are hardly comparable at this point imo.
Originally Posted by Blizzard Entertainment
Or have PTR research, or datamining, or have multiple characters for any scenario of mechanical differences. The list goes on. Higher end raiders while a very fraction of a percent are far more skilled in how they approach fights than they were during Vanilla and even Burning Crusade encounters.
If you dropped a fight like Argus during something like Vanilla with no previous history of encounters or the tools that higher end raiders have now, I think you'd see him live for quite a long time.
WF raiders now and then (Vanilla, TBCish) are basically playing two different games.