Alekhine's Defense = questionable?

It's a line.

Alburt (a GM) used to play 5. ... f6. So did Basman.

Well it's definitely not the critical test of the Alekhine. Most people consider dxe5 to be the critical response against the modern variation. Although g6 is playable (check my line against the modern from before). However, 5... f6 is a horrible move. If black simply plays 5...dxe5 6.dxe5 and Bg6. Black stands better.

Check this example:

7. Bd3 Qxd4 8. Bxf5 Qxe5+

the Bortinator has made it such a playable opening even in OTB events

Here is Bortnyk against the #2 Floridian in the state,  GM Julio Beccerra drawing in OTB classical

cool to see Julio being able to hold but even awesome to see the Alekhin OTB, really bortnyk has shown that even the most dubious moves can sstill be super cool and can work well

That's not the 7. Bd3 line given in post #83, though... which simply loses material.

Iḿ saying it doesn't achieve anything 

what does not achieve what?

He's 400. He probably assumes the Alekhine's loses a knight in three moves to e4 e5 exf6.

The pawn can be marched forward or protected with a horse of queen's pawn. 

That's literally the whole point of the opening.

none of those outcomes gain black anything 

The point of the opening is to provoke white to take more space than he can defense. Provoking whites, pawns forward.

Every opening is a trade-off. 

OR you can see it as an argument. Since protecting the pawn is obviously not challenging, only pushing the pawn must be considered. In that case, white is arguing that his space advantage will be lasting and restrictive, while black is arguing that the center is overextended and brittle and subject to attack. 

The game revolves around white's center, and if he can keep his space and restrictions or not.

i used the alekhine for my otb blitz tournament tonight, it was bad but a classic swindle

Fair points. However, I can still argue there are much better defenses against kings pawn such as 4 knights game or Italian. 

Both of those are pretty dry if your opponent isn't looking for an exciting game.

The Sicilian or the Alekhine's are likely to be more eventful.

The one, and only line in the Alekhine where white can claim an advantage, is this one:

White has maintained a nice central control, and all his pieces have good squares to develop.

However, Black's position is quite resilient, and it needs no more than one inaccurate White move to turn the tables.

I firmly believe that White has no advantage at all in the 4.Nf3 dxe5 5.Nxe5 c6! line.

What are you talking about, the 4 knights and the Italian are white openings. 

You mean Classical defence with e4 e5?

Probably an accurate analysis. Although, as an Alekhine player, I would rather face this line in the four pawns for the reasons you mentioned, than the modern variation. I feel like although this is objectively better for white, this is the type of game that black want by playing the Alekhine.