If that is your claim then you are definitely able to access Youtube's internal code / server somehow and tell me this exactly?
This is how the Youtube player works.
Step 1:
Player Requests Video, extra parameters either tell the player different methods of asking for this information or different changes to make to its UI
Step 2:
Youtube's server sends the player a video stream
Step 3:
Player plays the video.
Regardless of whether the video is sent using data from their AS2 format or AS3 format, both sets of data can be played in the same player, how do you know what the actual server is processing before sending that stream back? Unless you know something about Youtube's internals that noone but an employee of the site could, if you do then by all means say that you are an employee with inside information or something.
I have been defending the method in which the player reads the parameters, somehow you got it that I was speaking about Youtube's video server. I'm talking about the player. The server will send the player the data it needs if its valid regardless of type. The player will then based on the actual player's (the swf file, not the server) internal checks, decide whether to use the information or not.
In this particular case, I was stating that the player for youtube.googleapis.com will be in AS2 mode (nothing to do with the server again) by default, you can look at how the actual player (the swf file) works to decipher this. There are no server requests that say, Oh hey, change my color to red or change my color to blue. The reason its an embedded parameter is because the actual video (swf) file that it locates will take that data and turn it into something useful. Nowhere inside youtube's actual server data being sent in or out does it reference player color, player loop etc. The server (not the swf file) handles the video and the playlist information being sent. The player handles how it uses the information given. In this particular example, I am saying that when the playlist addition is added into the url for the swf file it might be bugging up based on a faulted or unexpected line of coding and running the video with the playlist (because in all honesty, all the commands could work on the same swf file as they use the same base, they just wrote it not to for whatever their reasons they had).
The end result is that the player uses the list and listType commands in AS2 mode even though its programmed not to. The server would have sent the data regardless the player (the swf file) is the one that decides what to do once that data is retrieved.
This has absolutely nothing to do with the server code. I'm talking about the swf file, I've been talking about the swf file the entire time bro.