My group plays more like this:
theres around 12 regulars.
1 lizardmen, 2nd gen slaan.
1 chaos mortals (tzeentch, my own)
3 boc (one Tzeentch, one khorne, one undivided)
1 dwarf list, hes got 6k and rotates lists.
2 skaven (both SAD skyre)
2 Tombkings, defensive builds
1 black orc heavy list (one of my old lists)
1 wood elf list
one of the skaven, one of the beatsmen and the two TKs are GW staffers.
We promote no list tailoiring, as such we all right one list and stick to it all games. This means lists need to be versatile but as strong as possible. Our group has a 2nd gen slaan list, 2 Tzeentch lists, 2 SAD and 2 defensive TK lists, therefore we tend to be very magic heavy. To put it lghtly 2 lvl 2's with a scroll each is about as useful as.... well nothing.
As lists are magic heavy or magic defense heavy you have to pick one. We also need lists that are tough to shooting (SAD, TK, Dwarves) and good in combat.
Tbh i reckon i could write almost exactly what 10 out of 12 of us field @ 2k (which we play almost exclusivly).
2k, no list tailoring, magic/magic defence heavy, resilent, good CC fighting lists are the order of the day.
Thats how we play. No one cried cheese or whines about imbalanced lists, it is a game.
The idea is to create a good army that isnt cheesy (becoz as individuals we dont want to win with cheese lists) that can stand a good chance against 10+ other lists.
Its cool.
For example, if I was to use chaos, I would declare my god in advance [always slaanesh], and if it was mortal, daemon or beasts, as courtesy for my opponant. If he was picking say Dwarfs, he could field a huge amount of shooting, but knowing the army I was picking, would probably only include a couple of shooting units but tool up for combat. When setting up I go "these are chosen, they have a musician, no other command etc" as we do not mislead or confuse people.
we basically know each others list of by heart, hell ask anyone in the group and they will let you read their armylists/army book with no issues. We often swap armies or races for fun, i typically love to steal the dwarf army and play some games (played and won 3 games yesterday with a dwarf list i made).
we are competitive and play to win, but not win at all costs. Hell i play the dwarf player pretty much every week and encourage him to take thorek ironbrow (which he usually dosnt do).
My arguement is that id use him, so he should feel free to. I dont try and write a list thats cheesy but i certainly dont ever ask/expect a player to downgrade a list, i often point out improvements thou!