Well, AFAIK, the internet tablets are advertised for mobile internet. They do that very fine compared to other mobile devices and even support Flash, which is very uncommon for mobile devices.
The devices were never advertised for mobile office or as a laptop replacement. They can be used for that and somewhat work, but fixing the OS to make the devices more useful in this direction has nothing to with fixing the software to do what it was advertised for.
Most people don't even install any applications and just use the tablet for surfing. Works as advertised.
Firmware updates for anything else than serious bug fixes (e.g. N800 corrupting SDHC cards) are nice to have and actually happen, but they're not required to make it "work as advertised".