Because it looks like Nim users love to program everything in Nim ;)
That said, there are a lot of ideas from other languages, frameworks, and communities that Nim users aren't adopting.
As an example, I was actually surprised that the Nim IDE Aporia was entirely written in Nim. I perused the source code a little bit and was disappointed to find code like "Add_<element>" -- which is an imperative approach to building the GUI. There are really brilliant ideas in Javascript frameworks like AngularJS that instead advocate a declarative approach to building the GUI.
Anyway, Nim is a young language. There is still a lot of room for growth.
I'm not sure it would help a lot because what happens for me is I have a ton of notifications from github or forums in my gmail, so many that I just have to ignore it all.
But the reason they are using the custom forum is because a number of people have worked hard on it and it serves as one of the test-beds for Nim. It also works exactly the way Nim people program it to which is nice.
https://github.com/nim-lang/nimforum you can create a pull request for email notifications. You would want to discuss it with them first on IRC and make sure it is opt-in and works in a way that is compatible with their server setup.
That said, there are a lot of ideas from other languages, frameworks, and communities that Nim users aren't adopting. As an example, I was actually surprised that the Nim IDE Aporia was entirely written in Nim. I perused the source code a little bit and was disappointed to find code like "Add_<element>" -- which is an imperative approach to building the GUI. There are really brilliant ideas in Javascript frameworks like AngularJS that instead advocate a declarative approach to building the GUI.
Oh give me a break.
https://github.com/nim-lang/nimforum/issues/57#issuecomment-134571728 says
The forum-to-mlist sync has been implemented and deployed.
however I see no instructions for how to setup email forwarding, would be nice to have.
Think of this forum as a minimalist server API (with a little bit of HTML parsing).
Write your own client libraries, tools, JSON / FUSE / SQL interfaces, vim / emacs / WordPerfect integrations, and bots. ;)