Even though Nokia managed to put everything imaginable minus the compass (Bluetooth, 3G, FM transmitter & receiver, IR transceiver, keyboard, stylus, GPS, WiFi, touchscreen, USB charging, MicroSD slot, 5M camera with LED-flash, TV-out) into one device, people still find some missing feature.
It's always like that and will always be like that. More stuff would have resulted in a larger and more expensive device. A production unit is always a compomise between what's possible and what's reasonable for marketing.
But the N900 isn't the end. More Maemo devices will certainly follow, lacking some of the above, but having USB-OTG e.g. There will be choice. Just not yet.