That's all in an effort to reduce costs and improve reliability. Less parts in any design equals more reliability.
Since your laptop is in need of repair, it may be time to get it fixed.
I have a white macbook core2 duo. The main battery is dead and I have been using it with the power brick. Lately when I plug in and start up I have to go through the reset time and date etc. I have heard that some of the newer laptops don't have the back up battery. Does this one, and how do I get to it to change it?