Sadras
Legend
The role is more central to the game, so in that sense it is important....but a game can't happen without players, either.
No one is arguing that the game cannot happen with out players.
The question is, Is the DM the most important at the table
Let us take a RPG table of 5
DM, Player A, Player B, Player C, Player D
Using Basic Maths
If you lose 1 or 2 or 3 players, the game can still continue, but the game does not continue if you lose the DM. Thus the DM > x players, where (x+1) players are the number of players at a table.
My comments in this thread aren't aimed so much at diminishing the importance of the GM to a game so much as pointing out that it's not significantly harder to GM.
That is subjective, perhaps even game dependent and does not take into account all the various types of players (casual, passive or otherwise). Furthermore, more often than not, the GM is the one usually rated on the success of the session not the player. It is true your statement speaks nothing about GMing well, only GMing - but this as well as learning enough of the rules as well as in most cases prep work required leads the perception that GM is significantly harder. I'd say the learning curve for being a GM is much more than that of a player.
EDIT: Are there exceptions to the rule, friendlier-GMing games, sure, but I'm not convinced it is helpful or meaningful referring to those games in this conversation.