> there are only three platforms: Blink/V8; WebKit/JavaScriptCore; and Geko/SpiderMonkey.
You’re misunderstanding the terminology here. The platform being talked about is the World-Wide Web and you are listing three implementations of the client part of the platform.
You are the one misunderstanding my point.
There ARE ONLY THREE implementations of the client platform.
I would like for there to be a hundred, and there would be if the platform was simpler, but its not, so there won't.