These seem to be mostly related to difficulties around adapting to a new programming model. Which is understandable, but do you have examples of more concrete tradeoffs?

For example, I don't think many would argue that for all the upsides a functional language with immutable state offers, performance can take a significant hit. And if can make certain classes of problems trickier, while simplifying others.

Surely with a model this unique, with the payoffs come costs.