Bulls need skills to get better/good. Probably at least 1, to make him more than an overpaid Black Orc.
No bulls = more options for the dwarves (skills) and more rerolls and an apo. And a mino. And a lot of FF. More Ff = more chance on FAME = more options.
It's not that YOU want the options, it's about denying the opponent those options.
More MA 6 =more speed ... (compared to) dwarves only have 2 players with MA 6, you have at least 4, with possible 2 more on the bench. Makes fouling easier.
AV 7? You have 6 guys with beards. You should be able to protect most of them, at least the important ones. Because there are only 4 of those on the field anyway, with 1 carrying the ball. The rest is fodder/distraction/the blitz you wont expect.
Hey, it works for some of us. Even that I dont foul (a lot).