Is 1.f4 a playable opening?

I have started adding the Black side of repertoire to my blog. In the weeks to come, I will have a complete repertoire shared. You will know what this fanatic Bird Opening player likes as Black!

Lurching Chess - Chess.com

Here is today's Bird Opening:

Good Chess! Keith

I have 61 out of 91 lines posted for my Bird/1..d6 repertoire. Sharp, lurching chess!

Lurching Chess - Chess.com

Here is a recent Bird Opening game:

Good Chess! Keith

my Bird's Opening game

Today I added 4 more lines to my Bird/1..d6 repertoire. Also, I did an analysis update to all other lines!

Lurching Chess - Chess.com

Here is a recent Bird Opening - From Gambit Declined game. I won a pawn with the thematic Bxf7+ tactic, and then I returned it, allowing 14..Qxd3, to get a strong attack.

Good Chess! Keith

Here's my Bird's game against the Isabelle-bot:

Yes. It is not the best, though.

They do not want people "mocking" them.

Carlsen could play 1 h4 and beat most Chessplayers!

There is no universally "best" opening, there are just openings that get you to positions you understand better than the positions you get from other ones. The positions from flank openings, particularly the kingside flank (Bird's and the Dutch), have aspects to them that can get you into trouble if you are not careful, but they also can get you some very nice attacking positions as well. Like any opening, it takes some study which needs to be backed up with actual game experience. It is a good choice for attacking players to add to their opening repertoire as it mixes things up a bit. How often you choose to resort to it will become a matter of personal taste; either it suits you or it doesn't. It isn't as well studied as other openings, so you need to be prepared to play chess earlier on.

Carlsen could play any two opening moves that don't lead to Fools Mate, and still beat 99.9% of players on the planet.

I added 5 more lines to my Bird/1..d6 repertoire today.

Lurching Chess - Chess.com

Here is a recent Bird Opening game. It is the twelfth time I got this exact win!

Good Chess! Keith

At your level, that surprises me. Even as a lowly 1400, I'm always alert to sacrifices on f7. I spotted the combination and would have played 6 ... Qe7

I played a Bird-Larsen against one of the theme bots this month (tina-temp 900), and while a 900 rated bot isn't really going to put any opening to the test, it was interesting to see just how badly things went for TT! I can't recall ever getting to the point where I've won all of a bot's pawns and pieces, and still have all 8 of my pawns.

It turns out that there are many openings in chess.

Had another fun Bird-Larsen game against one of the bots (SapnapBot, said to be 1000, but that's bot rating not human). Was a fun game, and the review only gave me two inaccuracies, so I was pleased with that.

Its definitely playable.
But on f4 e5 - the From Gambit - fxe is fine for white. 
The f4 player should be prepped for e5 though.
But what about comparing the Bird with the Dutch Defense?
Or - comparing f4 d5 with d4 f5 ....?
If the Dutch is good - surely the Bird should be better?
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But white is playing a reversed opening he didn't have to ...
if such openings are really great - they'd be played more ... but apparently white does better with d4 or e4 or c4 or Nf3.
d4 'can use' c4 soon after. Its usually good - or best.
e4 can also 'use' f4 soon after - but its usually really good only with certain move orders like e4 c5 Nc3 Nc6 f4.
So the objection to 1) f4 seems to be - white's got better.
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Idea: 1) e4 is played much more than f4 for a similiar reason to 1) d4 played more than c4.
But 1) c4 is played more than 1) f4 ... also.
1) f4 doesn't help with bishop development. Nor Queen-action. Not directly.
whereas 1) c4 does help the Queen.
I like 1) Nf3. Lets put the brakes on black's e-pawn plus develop a piece plus prepare castling plus take the opponent out of about 95% of his book plus give him no immediate pawn target.
So the Bird seems to relate more to openings where white plays a pawn to his third rank on move 1.

I am actually contemplating of taking the Bird as an additional opening to my now very small opening repertoire, i.e. the Orang-Utasn with 1. b4. I have one study book now "Bird's opening" from Timothy Taylor from 2006.

Anything else recommended on literature?

Ordered Lakdawala's "Bird's Opening: Move by move" from 2015 as well and saw there is a recent book from Haley (2022) with unusual replies to 1. f4 called "Unusual Birds: Bird's Opening: Unusual & seldom played variations that start with 1.f4"

Ordered the latter one as well