FWIW - Our school is basically WTF, bought I'm not sure how strongly. It's a small school and our instructor is 2nd Dan so anyone getting promoted to BB who wants the certification goes to a different school for a few months.
We favor instep kicks over ball of foot for roundhouse kicks. For front kicks (we call 'snap kick') the foot orientation depends on the target. Anything horizontal, like groin or bent over opponent, you use the instep. Anything vertical (chest, face, though) you use the ball.
Yes, we definately favor evasions and counterstikes over just blocking. Last night we practiced a lot with a spinning back kick as a defense against a rear-leg roundhouse, to get the opponent in the chest and stop the kick before it's fully around. A lot of times when we practice blocks it's more of a redirection or as part of a move and counterstrike. Often in sparring you do end up just blocking a strike, but that's more incidental than strategic.
We emphasize good technique and speed to gain power rather than leg strength. Power is important, but the way we seek to get power is through proper technique applied with speed.
And in conjunction with that, we don't do much conditioning in class. Almost all my conditioning is done outside of class. Class is more devoted to learning proper technique
A lot of it depends on the school/instructor, I suppose.