This is definitely a case of SE not wanting to control our actions and step on toes. Look at the responses to this thread as an example - some people are all for it while others would rather not have it. I think blocking and such would be fine (if done well - maybe a barrier of sorts for magic users a la Y'shtola), but running and tackling, as suggested? That could upset certain players who play as daintier/smaller characters, or lead people to think "my character wouldn't have done that!".

Of course, not everyone is going to be happy with what they choose to do with the cutscenes - the 2.55 events are a prime example of this, as many people were upset that their characters didn't fight back while others liked the decision. Overall they try to keep the player character as neutral as possible to avoid infringing on peoples' individual headcannons for their characters. Unfortunately this doesn't sit well for those who would like their characters to act a certain way instead. This is something I can't see them addressing anytime soon, unfortunately.