[smt88]

"Moving faster" is a dubious benefit.

Context switching is very costly. So is having to configure, support, and debug 3 different environments.

I understand using Node for realtime/async services, but using both Python and Ruby makes no sense.

[mac-r]

It depends on your knowledge of these tools. But you seem to be a wise guy. So I would say you are totally right, since I don't want to waste my time arguing.