Earlier quoted context omitted.
I've always found it weird when people say stuff like this. Clearly your last team was bad, you even said the developers were less skilled, and time constraints were problems and yet you manage to blame tooling. There's absolutely great test and CI tooling for JavaScript. The fact that you and your team didn't spend enough time to develop an expertise with them isn't the languages fault.
I clearly blamed a lot of things in addition to tooling in my post. My overall point, which I don't think you quite got, was that language choice doesn't matter so much compared to all those variables, and that I'm much happier and more productive now working in a less "sexy" language because of those other differences.
I'm more inclined to think that Palantir's problems are inherent to the enterprise revenue equation.
"Features and code quality that aren't contractually mandated" = profit
The more things you can put in that category, the more profit...