whois helps to know who is behind the content. Without that information it is hard to trust the app.
Say you are in the government and you install this app on your phone and it turns out to be a spyware.
Reading well written source code creates a more efficient workflow than reading api docs. For me, the fact that Crystal is written in Crystal gives it a far greater advantage.
Plus it is faster than Go/Java/Elixir. As others have pointed out, Crystal does have meta programming capabilities.
I love that everything is doable without lifting my hand from the home row keys,
the programmability, the lack of advertisements, the consistent emacs/vi keybindings and the low performance costs.