The problem with this is primarily that it's not the default. It's a remedial action to make a poorly functional system usable at a basic level. People in the

The problem with this is primarily that it's not the default. It's a remedial action to make a poorly functional system usable at a basic level. People in the know are aware of Classic Shell. Most people aren't. Most people won't take any remedial actions or even find out that there are options; they'll live with it, hating it, and despising Windows even more. The number of people who go to the effort of installing Classic Shell is a tiny minority of the total userbase.