This isn't really anything to do with the handset, the manufacturer, Google, or Android.
The correct question is:
Why have Adobe taken so long to make a Flash player for Android.
Well, they announced very early in the life of Android that they would create a version of Flash for late 2009 or early 2010. It takes time to develop software.
Bear in mind that it'll be free. Compare the number of PCs/Macs in the world to the number of Android handsets - I'd imagine Android phones won't even make up 0.0001% of Adobe's target audience. Development of such apps for a phone is much more difficult than for a much more powerful PC/Mac - you have to discover a lot of tricks to make it work well on the slower hardware.
I don't blame Adobe for taking their time making difficult software, for free, for such a relatively small group of people.
Maybe they just want to get it right?
It's only been in development a year...