That, and it should be compared.
Now, tons of people can down the last bosses on the lowest possible difficulty iteration of the game, balanced around mouthbreathers.
Back then, time restraints made it difficult for many to catch up, but you could get to see bosses of the highest tier (1 difficulty, aimed at organized raiders) despite being an absolutely shitty player on the basis that you had time to spend preparing for raids.
On current Classic Blizzlike servers, the percentage seeing bosses go down is plenty high, and it will be on the official servers as well thanks to the servers being forever locked from progression into TBC. It's inevitable when players having experienced 13 years worth of game evolution attack content that not only many of them already experienced, but is also bare-bones simple from a mechanical standpoint.