Unless you are Fischer or Kasparov, forget all about the Gruenfeld.
This opening is weak, it scores very badly at top engine 3300 level competition, white wins too many games, better learn and play the KID, which is much sounder.
Kasparov and Fischer played the Gruenfeld, but just rarely. they both preferred the KID.
I cannot find the opening statistics on the Grunfeld at 3300 engine level competition. Do you have a link or something to these statistics?
Concerning the Grunfeld, well, top engine competitions at the 3300 level exhibit 85% score in favour of white - only white wins with some draws in the mix.
Draw the conclusion yourselves.
The opening is very suitable for engines, please note, as of relatively open character.
The Classical Variation, building a strong pawn center, grants white huge advantage.
It's patterns at play again, rather than concrete variations.
More on the Grunfeld also in my new book, lol.
Do you have a link for this statistic?
If someone find the Gruenfeld Defense to his liking, play it! Why wait rising to some ELO 
I lose because my opponent is a better player not because the Gruenfeld is a weak opening This applies to most openings.
So i am or was a grünfeld player but i dont think any player rated below at least 1900 fide should play it because there are so so so many lines.İ personally have been playing it for 3 years since i was 1500 but today just by checking peter svidler gruenfeld short n sweet course on chessable i am convinced that if your opponents plays a less known line if you don't know all lines you will probably lose real quick.İ mean just check peter svidlers short n sweet course which is an introduction to actual course on chessable.İ think a beginner should play nimzo indian or d5
But of course if you know the whole theory in all of the lines which can last for 27 moves in one line then obviously you can.But i am telling you i think most of the people who play grünfeld and not are masters in chess probably won't have good responds to lines except main lines and even in main lines probably they dont know after move 15 or so
It's very useful, bearing in mind the winning margin in the middlegame/opening phase hovers around 50 centipawns or so.
This in turn means +70 centipawns does happen to be a winning position.
Don't you know what a full pawn advantage is?
Don't you know the two bishops are worth 50 centipawns, half a pawn on average?
Don't you know a doubled or backward pawn are penalised approximately by some 25 centipawns or quarter of a pawn's material?
All that knowledge is mentioned in a lot of books.
From there, if you spot you hold the bishop pair, while your rival across the gridline "suffers" from a doubled pawn, the addition will sum up to 70 centipawns or so your edge, right?
What's so difficult about that equation or visualising it?
Everybody does so subconsciously, just that some gamers know more patterns, and more accurate assessments.