The ultimate goal of the WIneHQ team is to have their own fully DX12 implementation. The reason why vkd3d-proton exists is that Valve didn’t want to wait for it to mature and AFAIK they did have differences in what should be included in vkd3d. Which is why they don’t work on the same project.
I’m no native English speaker as well, and that’s how I often think as well. In my mother tongue I know so many words, their meaning and their sound. In English, however, I’m still learning new words now and then, and it opens my world to the language every time. This is true for dialects as well.
Learning a new language is quite hard in the beginning, but it’s so satisfying and world opening when you start to actually use a new language.
edit Ohh, and sorry for my bad English ;)