[mac-r]

this is very reasonable in terms of flippa and other tools. in terms of 3 different languages - each is good in its own way. i would agree that rails could be totally replaced with node. but overall picking the right tool for each specific problem allows to move faster. you probably know how many languages are used at the backend of github, google, twitter etc.

[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.