Third person: I like it because it just feels better, I don't know why I use it. But when I use the other locking position (270?, 180?) it's just waaaay too sensitive and I'm not able to drive anymore
I always use full lock, only in open wheelers I adjust my LFS settings to compensate the turning, cause driving an open wheeler with full lock is impossible, I tried...
So basicly, it's just preference I guess, I love it when I skid out or something I have to start turning the whole wheel around, it's harder, so it's more satisfieing, I guess.