Whether intended or not, there's an undercurrent of "you're all so dumb for using Python" (or Ruby, or PHP, or other similarly performant language) here. I want to surface that and question it a bit.
It's totally reasonable for a company to choose the Python/Gunicorn option if they already have a bunch of people who know Python and they don't need to serve tons of requests per second.
Even if they do need to serve tons of requests per second, it's totally reasonable for them to still choose Python/Gunicorn if the cost of the additional servers is less than the cost of having to support multiple languages. Or if they get a lot of value from libraries that are unique to the Python ecosystem. Or if they care more about quickly iterating on features than driving down server costs.
I agree that there's a point where it stops making sense, and there are plenty of engineers who don't recognize when they're past that point because they keep doubling down on sunk costs and things they're familiar with. But let's not be too quick to assume people are in that camp when we don't know all the tradeoffs they're facing.
It's totally reasonable for a company to choose the Python/Gunicorn option if they already have a bunch of people who know Python and they don't need to serve tons of requests per second.
Even if they do need to serve tons of requests per second, it's totally reasonable for them to still choose Python/Gunicorn if the cost of the additional servers is less than the cost of having to support multiple languages. Or if they get a lot of value from libraries that are unique to the Python ecosystem. Or if they care more about quickly iterating on features than driving down server costs.
I agree that there's a point where it stops making sense, and there are plenty of engineers who don't recognize when they're past that point because they keep doubling down on sunk costs and things they're familiar with. But let's not be too quick to assume people are in that camp when we don't know all the tradeoffs they're facing.