Well, yeah (and that's absolutely a good thing), but that doesn't mean the built-in applications shouldn't strive to be the best-of-breed at what they do. Tablets are quite powerful devices but rootfs space is limited. The "WONTFIX because there is a community alternative" approach means that by the time you install (random examples) claws, evince, leafpad, canola, pidgin, tear (eventually) etc you'll have very little space left. Not to mention that currently filling the (JFFS2) root filesystem eats up RAM as well.

IMHO is there is (for example) a PDF reader in the shipped firmware it should either be the best reader available, replaced with the one that is, or at least made removable (not depended on by osso-software-version-xxxx).