Try not to sound like you're diminishing the efforts and accomplishments of others.

This is tremendous work, they're running their business and come up with generic/generalisable solutions instead of narrowing the outcome to their own benefits only.

When Facebook spends engineering effort to work on React, it's not out of the kindness of their heart, and that's ok. It's still productive and an accomplishment, it's just productive for a reason that pertains to their business. It is the same here. This tool helps the adoption of Elixir, running Elixir is their business, so yay! But the comment I was replying to implied this is somehow entirely separate from their business, which it's not.

Not really sure how it sounded like I was diminishing the accomplishments of others. How would you have phrased the point?

FB has thousands of engineers. It's not that often that a small group of people can both keep the lights running financially and also develop fully featured massive libraries. I'd say that counts as a very productive company.

Right, but again my point is that developing this fully-featured library helps keep the lights on. The two things are not separate as you keep implying.

Not disagreeing that they are productive and accomplishing a lot.

I fully agree on the analysis. I can't say I'd have done a better job at phrasing, but I would have emphasized on the balance between business and contributions, rather than (from my reading) insisting on the business implications mostly.