"You can also bet that a full stack js dev would rather buy your Kafka wrapper than learn Scala, which will do nothing for her career prospects."
The implicit point is that we often abstract to the level of the company, but we can (sometimes more profitably) abstract just to the level of the purchasing authority (and those are often different and have different incentives).
My reading comprehension is bad then because that's a very confusing sentence.
- There are lots of full stack devs that would rather learn scala than a kafka wrapper. In fact, I would say it's more likely because a full-stack dev is inclined to be more flexible and learn different tools.
- Not really sure that kafka and scala are one-to-one comparisons
- I am also not sure which one "which will do nothing for her career prospects" refers to. Is learning a wrapper for kafka useless, or is learning scala useless in that quote?