Back in the early 2000s, the hybrid models (the ones with a keyboard) became the most popular Windows tablet products. A keyboard is a pretty convenient way to work around the shortcomings of handwriting recognition.

Most owners eventually used them like laptops unless illustrating, or operating in a sort of "personal presentation mode," where folding the screen flat was convenient. For most people, handwriting recognition was a cool trick that didn't get used much (as I suspect it was for you, eventually).

The utility of a handwriting recognition system is ultimately constrained by the method of correcting mistakes. Even a 99% accuracy means that on average you'll be correcting about one word per paragraph, which is enough to feel like a common task. If the only method of correction is via the pen, then the options are basically to select from a set of guesses the system gives you (if it does that), or rewrite the word until it gets recognized.

But if a product has a keyboard, then you can just use the keyboard for corrections. But if you're going to use the keyboard for corrections, why not just use it for writing in the first place...