Why there are illegal formations?

[newc]

Hahaha Nordeous have a sense of humour :P

3 wide in defence is not illegal irl, and it is used. Okay, teams don't start with it but you do find cb's move to striker in last minutes.

if 3W in defence is so effective like T11,why no team use it in the start. Cos their only CB will get rating 0 from the match, any ST,AMR AML will be very glad to see it,any long pass/through to ST would result in a goal,but its another story in T11
the only reason Nordeous bans some formations cos they cant improve their game engine to balance it