However many management people believed that customers don't care design details and it can't sell
It is worth noting that, as evidenced by the fact that (e.g.) Toshiba still sells plenty of computers, many customers really don't care that much about design details. No doubt there are many who do, and no doubt there is a third group that vacillates back and forth depending upon what seems trendy that year or what their friends have or whatever.
Some of the "no design still sells" can be attributed to "corporate buyer doesn't care about people using what buyer is buying".
// I should say that Toshiba does have some good design in some of their products
I like my Portege, thanks, very low weight (~1.1kg for my model), yet still including DVD writer etc.