thing is, the deb system and repos work, when there is a large pool of people handling the creation of debs and there is a similar pool of ready source code to made debs from.

on the tablets, this is not equally true, and so people come up with ad hoc solutions and beta software that they want to get people to test before putting it into the general software pool.

basically its a problem of fine grained control. if you open your tablet to extra-devel, you get the whole deal, warts and all. you simply cant say that your only interested in the devel version of tear or some other interesting but not "must work" important.

or you can, but that means having to dig into some config files that have no friendly ui...