Talking about the past is something I agree with you. I just don't see a point with bringing up something personal that can no longer be changed unless it's very relevant to the current situation. For example, my mom telling me about my medical history from when I was a child is absolutely fine since it's necessary information. However, my mom telling "funny stories" about my childhood, to other people no less, is not necessary. If my grandparents were still alive I'd get revenge on her by asking them for "funny" stories about mom's childhood and spreading them around... hmm, but she does have quite a few living siblings. Am I being a brat? Yes, but getting a taste of her own medicine would probably do some good to my mom.
As for the future, I have the opposite problem with my mom. I'd love to talk about future with my mom (or anyone really), about what my plans are and all, but she tends to change the subject or not really listen if I try. I don't really know why, maybe she thinks I'm aiming too high and will just be dissapointed when I fail. And yes, she really seems to think "when", not "if." She doesn't have a lot of faith in me due to my autism and physical disability, and while I don't deny the possibility of her being right, I'm stilla gonna try and would like it if she was supportive of my dreams. And it's not like I'm really even aiming that high; most people would consider what I'm reaching for to be a normal life. To me it just is something I really have to fight for since my chances of reaching it are lower than an average person's.