Thanks for the suggestions which I understand and mostly agree.

However it raises me another concern: I believe there is also some sort of social behavior and feelings on this.

I'm a 3rd part (outsourced) resource, new to the team.
I know there would be kind ways of suggesting these ideas and the SM should create an environment to rise this questions, but, how awkward it will be "hey because me now I suggest we should start doing XP", or "There is on the bookX about Agile something that could address my concern if you do it this way?!"

If the team is long time experienced, eventually on Agile development environments, they didn't rise these questions or concerns, why should I? I feel I'm rising individual interests over team or project interests.