Well, please don't dump anything completely. I use the Sharp included PIM's daily (and sycn them with Outlook) as well as the Sharp included Mail app. I also use both Opera and NetFront. For some reason some sites work better with one and some with the other. Go figure. I also still use the Sharp included media player for movie files. For some reason, I guess I convert them wrong, Kino 2 does not work as well for the DVD's that I have converted.
So I guess I vote for keeping what is in the current ROM. Or, if you do pull anything, like the Sharp media player, make an IPK for it so we can add it back in easily if we find Kino just doesn't do the job for us. (Which is a shame, b/c Kino is very cool.)
I am open to the idea of installing some things as IPK's, but after a while, if I am installing everything back on that was taken off, the point gets lost.
On the other hand, it makes updates easier that way. The "Proto ROM" or "Kompany ROM" that Proto put out (that was mostly a copy of the Cacko ROM) used a modular aproach. It included no software and you intalled it all via IPK. That made it VERY easy for Proto to release patches to any one package. (Until he dissapeared off of the face of the planet.)
It would be interesting to see what the actual space usage difference would be between an approach like Proto's ROM where all apps are IPKs put on after the ROM, and one where every app under the sun was prepackaged in the ROM.