Windows might have chocolatey, one among a small number package managers for Windows (including the bleh Windows 10 Store), but not being baked into the OS distribution means the average user isn't going to install it. Users want what's already in the Start menu/page, not something they have to go to a site, copy some (as far as they know) random text, paste it into a power shell, and then hope it works. You effectively need a package manager to install the package manager. That might be ok for your power users, but the average person what wants to install GIMP because he's been told by his mate down the pub that it's "like a free Photoshop", would rather go to the GIMP site and download it, he won't even know about chocolatey because he's so used to using Windows without a package manager that he'll just Google "GIMP" and hope the fist link is the right one. Windows missed the boat on package managers and the Windows 10 Store definitely does not make it any easier.