> If people in a company don't know what they're doing, yet (it appears) have a deathgrip belief in the equivalent of something they found on StackOverflow or in a blog post... doesn't that reflect something about the company?

No, all that it reflects is that the company does not prioritize hiring people who interview well, or training people to interview well.

The company also probably does not prioritize hiring people who speak Finnish, or training people to speak Finnish.

Neither of these two signals are any indication that the day-to-day work environment is going to suck.