Define "seamless"...
(Disclaimer: although I’m all for constructive criticism most of the time, this is clearly nothing more than a rant, which by the way, does not even deserve translating.)
Lets start with a dictionary definition of the word seamless:
adjective. perfectly consistent and coherent
Now lets take a look at a quote from the website of a product I decided to work with while writing my book on WPF (highlight mine):