Trying to call the Grand Prix unambitious compared to the open sicilians... makes me laugh.
As white, you have a choice between:
1. A line that black scores better than white in, but is stupid easy to learn
2. A line that white scores better than black in, but takes a little bit of effort
Choosing option #1 (the grand prix attack) would be the very definition of unambitious. You are quite simply giving up your advantage (in fact taking a disadvantage) for a simpler game. This is no less unambitious than playing the london system.
Please explain in more details why Grand Prix attack Sicilian, c3 Alapin, and Closed Sicilian are, in your opinion, unambitious openings, giving white a disadvantage ?
And please show us a few of your chess games where you easily reached an equal position with black against those variations, as well as a few of your chess games where you as white got an opening advantage in the Open Sicilian.
I'm arguing the position as a satirical comparison to his original argument against the london system. If you think the argument is ridiculous, you're right.
I don't play for advantage in the opening, and I have played c3, grand prix attack, closed and open sicilians, smith morra, london system, colle-zukertort, and d4/c4 mainlines. They're all fine. Personally I prefer playing 1. d4 with 2. c4, but I can't say that I'd be any worse off with the london system.
As far as the actual score of 1. e4 c5 2. Nf3 vs 1. e4 c5 2. f4, we all have access to Game Explorer and the statistics of the win/loss/draw rate in those lines is very easy to look up. Suffice to say, statistically speaking, choosing 2. f4 does put white at a disadvantage, especially compared to 2. Nf3.
Whether this actually matters at our lowbie (sub 2000 or so) level is unknown (I don't think it does, maybe slightly more for correspondence than other forms of chess), but those are the statistics.
Again personally I don't see anything wrong with any of these openings. I do notice sometimes when I play the London System OTB it throws my opponent into a fit, much like this guy. So, that's an advantage right there.
No. It's the blinkered fixation on openings per se that's the overall problem.
The "best" opening is the one you know better than your opponent. Even if it's the HIPPO, and you play it with both colors, like former WCC Spassky.
Overall, if you're under Expert Level playing strength, it's all just Opening BS.
So Get Over It.
You'll save yourself thousands of mindless, opinionated, keystrokes. Very Simple.