Because i already freed up several (in the multiple tens) megabytes by moving and symlinking single files and whole directories, repeatedly over the course of 12 months, but said space grew smaller and smaller starting shortly after regaining something and during today's update not even some bytes were left. History repeating. You can have not enough free space; packages will keep eating your rootfs space with impunity for no particular reason.

Because /usr should be able to use a separate partition by mounting it from somewhere else (compile custom kernel with mmc driver enabled?). It is supported in Linux per se, so why is Maemo restricted?

Because there were users that moved the whole rootfs out of NAND.

Because Nokia went cheap on the same level that they went cheap on the RAM as they went cheap everywhere regarding HW on the Symbian phones.

Because optifying seems like being a "only-nice-to-have' extra during development of so many packages.

Because i will see if speed is really that lame.