How would spear bracing be useful against cav? Arabians would just dance around you.
If we somehow get archers to do arrow volleys, and then implement fire arrows, I'm probably going to have a nerdgasm.
I really wonder if those guys that made those 'improved' faces are actually convinced that they improved anything. Every example they posted looks worse, except maybe one.
In the end, I'd rather have stable and responsive gameplay than all this semi-useful crud. If there is anything nice that can be implemented without ruining stability and performance, go for it. If not, these things are definitely not worth it, apart from the fire arrows.