SEAL DEVICE: you seem to ignore that blocking even the last bit of airflow eases overheating.
OMAP44xx or MEDFIELD: yes, a bit of extra computing power is always welcome. But it has a price (money and battery and possible hardware/software problems). Did you overclock your N900, didn't you? What about 1150MHz vs 600MHz? Did the "almost doubling" double your "user experience"?
128-256Gb: I stored my entire MP3 collection on the N900 and still have some gigabytes for placing movies and anime (which I delete after watching: do I actually need already-seen movies on my phone every day?)
HDMI, DACs, SPDIF: how many times in a day you *need* video output capabilities from the N900?
MicroUSB 3.0: how many times in a day you *need* USB3 peripherals?
MicroSHXC UHS-1: how many N900 owners bought a microSD to enlarge those 32Gb internal flash?
Wifi-N, HSPA+: what is the medium file size that you transfer on your N900 (except for movies)?