It's also more effective on shields because while most weapon have x0.5/x2.0 block cost modifier and 90 block angle, shields have x0.25/x2.0 and 120(some 180). Interesting enough, rapier actually has the same modifiers as shields, so an argument can be made for push/block angle.

Spear also has 180 inner block angle, but since it has x0.5 for inner, it would be more useful to take BCR.

For dual swords, BCR is way more effective because it has a modifier of x0.5/x1.0. Same for sword and dagger, but because its inner block cost is x0.8 and BCR is needed to help with that.

Dual daggers have 40 inner angle and 4 stamina. It's not a good idea to not take BCR. Dual daggers and dagger are also very mobile weapons, it will only be overwhelming situations that you need to block an attack. BCR is more helpful in those situations than push/block angle.