Simple: all that processing power will affect the battery. Your argument seems to be (and correct me if i'm wrong) give us crazy power to compensate for shoddy coding because Nokia will drop it after the 24 month legal period they need to support it - which is a fine assumption after Maemo 5. But MeeGo isdevelped by multiple sources and companies, not just Nokia, and the N9/50 will receive the future updates, which, one would assume, will iron out the bugs.
Now, i totally agree that it should have great hardware and high RAM etc, but I don't want MeeGo to be an Android situation where, to differentiate from everyone else, the hardware manufacturers can only compete by jacking in more and more specs, so the average ***** thinks 'oh look, a high number, that's better!' with no recourse on, for instance, the battery life.
The N8 is a bad example but the C7 isn't, it has a modest processor and works smooth and quickly. Maemo 5 out of the box runs very snappy too. Point being it's not all about the processor, but optimisation, as we all know. I, and i think most others, would like it more if MeeGo were built well enough so it could advertise the fact (for teens to understand) that "hey guys, we build our OS so it runs as well as Gingerbread but on a lower processor, meaning you get more battery life" or whatever. One of the biggest gripes about Android is the appalling battery life, jacking it up with a 1.2GHz dual core processor won't help that in any way. As has been said already, fix it at the foundation rather than using this band-aid approach