1) Unfluffy: Taking a list that should never happen in the 40k universe, despite codex legality. 4 Rune Priests will rarely be involved in a single struggle and would especially dislike being too much alike, so quad-JotWW fits here. Also things like a Nids force without Rippers, any Guard army fielding solely Vets as their troops, Daemons running both Khorn and Tzeentch units, or Tau bringing a Shas'O to a 500-point game. Note that this does NOT mean a list is powerful, in fact most "fluffy" choices have basis in general tactics and efficiency.
I've taken a single Infantry Platoon in my IG army, which would hopefully be maxed out, but the rest of my troop choices will be vets. Its a Vostroyan army, so I thought it would be allright 
And most 500pt games, I couldn't take a Shas'O due to stat restrictions (Combat Patrol, School League rules)
SO your saying anyone who uses tyranids without rippers is "anti fluff"?
Also, with regards to all veteran guard, have you heard of the armageddon steel legion. They have survived alot and been through heaps, therefore it makes sense to take an all veteran army.
But regardless, i agree with pretty much everything else listed. A small patrol consisting of 3 or so squads should NOT be led by the most experienced type of Tau Battlesuit Commander, who should be off doing his army. Similarly, Tau should be forced to take a SHas'o in large point games (2000 and above) because they have the most experience with that kind of thing.
So, to clarify:
Its half way between TAC and tooled.
Yep.
Which in turn could theoretically be meta'd by the SM players.
For example, if they all played infantry heavy assault lists, but one knew that the upcoming tournament saw lots of Anti-MEQ weaponry, then they might take dreadnoughts to beat the assault lists which also would stand a better chance at the anti-Meq stuff that he could expect to see.
In a way, he made his already balanced list even more suited to all corners in todays gaming society. This is good isnt it? he isnt tooling a list towards any particular thing, but just knows that somethings are popular now (for example, i know that in 1500 points 1 hammerhead is hardly enough to take down the amount of armoured vehicles which it may need to, and it can be wiped out quick, so i generally use 2...if i happen to be in a game against a footslogging guard army i could beat him considerably unless he brings them down early, but considering the same race could also bring 6+ heavy tanks to the table, i think that i may even need broadsides (btw i also have 2 AT suits)
Ok, time for me to sound stupid.
What is "The Metagame"?
Go wikipedia!
Metagaming is a broad term usually used to define any strategy, action or method used in a game which transcends a prescribed ruleset, uses external factors to affect the game, or goes beyond the supposed limits or environment set by the game. Another definition refers to the game universe outside of the game itself.
In simple terms, using out-of-game information, or resources, to affect one's in-game decisions.
But this isnt cheating. Its say using experience from non warhammer occurences to help you know what to do here. Its like say watching a documentary on how armies work with eachother in a slightly different way they had thought about it before, and they decided to try it out as a strategy. It could go really well, but it could go bad. Eitherway though, it isnt cheating.