@xxxxts

Your use case has dramatically changed, then.

The N900, was a developer's platform - what other phone is out there, that has a hardware keyboard, works acceptably as a normal phone and can boot any ARM Linux distro you can find?
It's a geek's toy, clearly not aimed at the John S. Smith consumer.
And as you may have noticed, it is quite rough around the edges.
And yes, I will parade around the word: COMMUNITY COMMUNITY COMMUNITY. It's the one thing the N900 can still rely on these days. Same for the N9. It sucks, but Nokia doesn't seem too keen on making a Harmattan HE for the N900 like the NITs before it.

Oh, and before the N900, Nokia has had a history with pump-and-dumping Maemo users. Especially regarding the whole opennness thing. And the PowerVR MBX driver thingy.

And post-N900 (aka N9) - it's stillborn. Period. Nokia will probably cease updates after PR1.2 or PR1.3.
Had lots of potential though. What a waste.

Android, is well, Android. As long as you don't buy from Moto and HTC, and stick to flagship phones (hint: these cost the same price as Nokia flagships), you bet it'll stick on XDA for years.
The difference is just in the hardware, really.
It's pretty easy to use, and for aforementioned (modern) flagship devices, only massive autists care about the lag.

iOS devices are plain, simple things.
They work well enough to be a phone, and a platform for casual games (Infinity Blade is a b***h on a 3.5" screen)
However, doing serious geek things on them is a pain. Yes, I've tried. Yes, I've jailbroken all iOS devices in my house (wanna see them side by side with my N900?). The VKB takes up almost half the screen, and is tuned for daily typing, so any sort of CLI admin work is a real PITA.
(P.S.: The overclock video you showed was basically turning off power management. That's like "kernel-config limits 1150 1150")

tl;dr: Nokia does things half-baked (but lets 1337 users bake the other half if they wanted), iOS devices spoonfeed the user, Android devices are kind of a middle ground, given the right hardware and community.