You assume that sandboxed apps means we get all the negatives and none of the benefits.  That is unwarranted.  We can adopt the good parts and improve upon it based on the lessons learned from adoption of app stores across multiple operating systems and mobile devices that serve a much broader audience.  We should be willing to let competent contributors who are interested in doing that try it and provide useful feedback when necessary instead of dismissing it on bad assumptions as a knee jerk reaction on our experiences with proprietary software or bad conduct of particular companies.

For a server oriented user those sandboxed apps might not be relevant and they might be contend to get their apps from the distribution but sandboxes apps are a fine tradeoff for others who prefer to be not locked in to a narrow channel for all their needs.

Lets not pretend that commercial sucess doesn't matter as well. Fedora might be free for you but it is certainly not free for say Red Hat and their continued participation is dependent on Fedora being more successful as well.  I for one, consider this a good thing.

Rahul