> Isn't that one of the whole points of copyright? So the authors can print new copies and not have to compete with other people releasing copies they made?

The more important point of copyright is 'to promote the progress of the useful arts'. The 'securing for a limited time to authors and inventors, the exclusive right to their writings and inventions' is just the means. Do the means in this case seem to work well in achieving that goal?

> Nothing is stopping people from keeping an archived copy until copyright expires.

Except the 70+ years it takes before you're legally allowed to publish it, or even just adapt it. If I'm going to play things by the book, even if I archive it when I'm 10 years old, sales stop on day two of the copyright period, and the rights expire the day after it's 70 years years old, I will be 80+ years old when I'm legally allowed to let people download it, or I myself can publish an adaptation (or more likely, I'll have died and my archive version will be lost in the estate sale).