App store for a computer? Great! As long as it never becomes the ONLY way to install software, like on the iPhone & iPad. #Apple
The app store model has been available in major Linux distributions for years, but you can always add third-party software.
GUIs for Linux’s APT & Yum are basically app stores for free software. Linspire had an actual app store back in 2002 https://en.wikipedia.org/wiki/CNR_(software)