Playing scales up and down with my left or right hand does not interfere with what I am reading .... so I can go on doing this for an hour or two more while I read, hoping that it makes my hands/fingers stronger.
How about listening to the radio or keeping an eye on the TV while doing technical exercises, like Hanon for instance - anything inherently wrong with that?
Yes there is something inherently wrong: You shouldn't be doing Hanon.
oh i hate it when there's something to read in front of me whilst i'm playing it's SO annoying cos then i read it and get distracted. i don't even like having the musici'm playing in front of me let alone anything else!this one line from the song that i was reading and it drove me insane!
Why not just concentrate on the scales while you are practicing them? I learned I accomplish a lot more in twenty minutes if I am thinking about what I am doing rather than just doing the same thing over and over for two hours. ...If one doesn't pay attention to what they are doing it is easy to get improper technique, which leads to tension in the hand. Next thing you know your hands won't be able to do anything. Not a risk I would take. I wouldn't plactice piano with the same sorta automatic process as one uses when washing dishes. This is not a very good example. When you wash dishes you aren't thinking about improving your technique of washing dishes. You are simply trying to get them clean. If you practice with your mind on something else it won't do anything productive in my opinion.
I am impressed that you can type an email while reading the news simultaneously. I can only do this if I do one, and then the other.
If you are going to play piano, your concentration should be on nothing other than playing the piano. Otherwise it is a waste of your time.