Considering how i use computers, most of the time i found it far more convenient to apt-get search and 20s latter install (or the equivalent with the package manager you use) than downloading a random piece of software from a random internet site, which from this point might become a risk if it does not auto update, and if it does it's with a stupid yet-another rewritten auto update program that always uses 50 MB of RAM for just one program installed on the system, even when the program does not run.

And considering the success of "app stores" and the general dislike of the traditional windows desktop computers by the general public (except if you are fool enough to help them for free doing all the busy work maintenance tasks that can't even exist on serious systems), I guess the centralized packaging and distribution model is also pretty convenient for the general public...