Not saying it is a good thing, but an organization, especially if there has been a lot of turnover, can enter a state of status quo.

> it must have that architecture for a reason, we don't enough knowledge about it to touch it, etc.

That or they simply haven't had the time, cost can creep up over time. 300k is a lot though. Especially for just 200 replicas.

Seems wildly in-efficient. I also don't understand why you wouldn't just bundle these with the application in question. Have the go service and nodejs service in the same pod / container. It can even use sockets, it should be pretty much instant (sub ms) for rpc between them.