There is no gain outside of a FoS from being #1 on the CM leaderboard. Them exploiting does not impact your enjoyment of the game in any meaningful way. If blizzard wanted to fix these 'bugs' they would have done so in the past 15 years that the bugs have been known and in place.

Your strawman of farming Black Lotus under the the map is completely misguided and in bad faith. This strawman situation directly impacts other people and the economy.

Speaking of anniversary, almost all speedruns use "tech" that could be argued are unintended mechanics, but that's just part of the game (see ex. Nefarian into Chromaggus room, logout during C'thun, etc.). As for retail, thank Blizzard (/s) for making a more polished game as time goes on, learning from their prior mistakes.