Qt for Nokia is an asset as long as code written for Qt can be deployed on lots of platforms. That is after all why Nokia bought it in the first place. So, with Qt in place, Nokia has a very good value proposition to (commercial) developers, which is the size of the Qt user base. Qt is capable of hiding the differences between Symbian^4 and Maemo 6 for a lot of apps, and that means that Maemo 6 and Symbian ^4 devices can be counted together as a single platform.

But, as soon as there are differences between Maemo 6 and Symbian^4, there won't be a single platform anymore, and the value proposition Nokia is making to (commercial) developers drops hugely in value.

Nokia should know this because they had at some point three different UI's. S60, S80 and S90. And even though S90 and S80 were almost identical, the differences were big enough so that only the most trivial apps did not need porting. S60 and S80 were so different that all UI parts of apps had to be rewritten. A bit later, Nokia killed S80 with the excuse that two UI's were too expensive to maintain.

And here we are, 5 years down the road, and Nokia is making exactly the same mistake again. I believe that "flabbergasted" is a better description of my emotional state than 'anxious"