I can answer it from my perspective.

Scala is a powerful language, so you can be succinct. It's static typed, so it is maintainable as the codebase grows.

However, Scala is complex and difficult to learn. But overcoming that hurdle is a one-time thing.

In my view, Scala shines for a small team with, at least, one scala expert. We can achieve a lot of things with speed, safety, and relatively smaller codebase (compared to when using golang or java).

To give a contrast example, if you hire a lot of developers and care about perfect code quality, then golang is more appropriate.

Just curious, why do you say golang is good if you care about code quality?

Golang is extremely simple. There aren't many choices in design. so it's easier to control quality.

It's funny you say that, I learned it because I believe it's in demand commercially, and is also a joy to work with. I perceive that companies using Scala would be on average better to work for (from a developer's point of view) than those using say NodeJS or PHP.

There’s a lot of scala teams around, especially in finance.