Why did it hold so long for computer developers to simplify the repair and assembly of the P.C.?

Why did it hold so long for computer developers to simplify the repair and assembly of the P.C.?

Evolution of technology. We couldn't realize the moon until airflight was developed.
Probably the answer is "Planned obsolescence"

If you put together something too well, consequently the possibilities of selling more units as time go by lessens.

Make it inadequately, then Gradually catch better, and then find a bearing to make more bread as the Cash Cow gets Better, Healthier, stronger