It's all the clearer that Apple have the technology to provide handwriting recognition if they really wanted to.
And Ferrari has the technology to build a dump truck if they really wanted to. Clearly, though, Ferrari has decided that their product model doesn't call for a dump truck, just as Apple has decided that their product model for the iPad, which I might point out is designed around touch input, not stylus, doesn't call for handwriting recognition to be built in at the OS level.
I even got in touch with someone at Access Software (who made the Grafitti used on old Palm Pilots) -- they have an ap for handwriting recognition for Android but not iOS. Why? Because Apple's licensing policy won't let them create a keyboard template (which would be the mechanism for enabling handwriting recogntion).
Doesn't seem to be much of a barrier for the developers of the other apps that offer handwriting support including handwriting recognition. If you are referring to third-party developers being able to add OS-level services, you're right, Apple doesn't allow that. The ability for third-party developers to add service-level functionality to Android is one reason why there is such concern over Android's security (or lack thereof).
In all honesty, I regret having bought my iPad 2 at this stage -- not that it isn't capable of doing this technically, but Apple's sheer will.
Sell your iPad, then, and buy something you feel better suits your needs. There are many people who'd willingly buy it from you. Posting here, particularly in a thread that was last active several months ago, won't be of any benefit to you.
Regards.