Why not open up "english" for other languages?
There is no "cplusplus.stackexchange.com" and no "charp.stackexchange.com", so why is there an extra "english.stackexchange.com"?
It would be much better if we had this platform for natural languages of all kind. I often enough wonder about how certain words of my mother tongue developed. It would be good if I could ask them here.
Why don't we change the site to be called "linguistics.stackexchange.com"?
It is, in my opinion, a better thing to reward people for knowing more than their own mother tongue or more than just English. If people grow to have multiple tags like "English", "German", "Spain" etc, that would be a nice achievement and a good reason to have linguistics. The world is connecting together, it would be most natural if StackExchange would encourage that and help the community to understand each other.
On the other side, if we split this up like that, more seldom languages like esperanto are unlikely to ever get their own site, much like the brainfuck programming language would never have gotten its own site.