Well, Nokia's criteria (eg reduced support costs) may not necessarily coincide with mine (device longevity, especially past the warranty period) while both are valid individually.

Survival over what period and usage pattern? Keep in mind that flash writes impact the entire block device (not partition), so having things like swap, journal, .ash_history etc on the same chip have a cumulative wear effect.

BTW, there was some speculation that there's an extra (faster?) memory device in the RX-51 specifically for swap use, but I've lost track - was that ever confirmed either way? If there is, it could also be used to store the ext3 journal.