Why bet on Ruby, today, for a new project?

Your post sounds quite angry.

Not my intention, like I said on my disclaimer.

Lots of apps are still mostly authentication/authorisation/CRUD used by a relatively small number of users and Ruby and Rails suits that kind of application well.

I absolutely agree with that, but then we are talking small work for small companies; What about systems larger than that? If GitHub wasn't created and it was on your lap to decide the underlying architecture, how would you justify the usage of Ruby like they did? Also, in a large company, if you were to do something small, how would you justify introducing another tech stack in case Ruby wasn't used before? You shouldn't build something only you'll be able to maintain.

/r/ruby Thread Parent