Don't think that's necessarily true. Yes, lots of programs implement app stores or plugin systems. But often the users also don't want to fiddle with add-ons, t

Don't think that's necessarily true. Yes, lots of programs implement app stores or plugin systems. But often the users also don't want to fiddle with add-ons, their installation and settings. They want a good and well-integrated out-of-the box experience. Especially if they are not from the tech domain. E.g. let's look at Eclipse: It was based purely on AddOns right from the beginning. And still many people want to replace it with other things (probably without AddOns).