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> there’s simply no way you can reach expert level with such a diversified codebases.

What are you talking about? I’ve checked in production code in 4 languages in a day.

Once you learn your first few languages you should be able to learn the new syntax of a language in a day or two and a good portion of their idioms in the next month (as you know more languages you’ll notice what’s unique about each language and glean idioms from online tutorials and your local codebases).

Being a polyglot is a huge part of many in our industry, especially full stack development. For one project alone I had to work with a backend that was part Java and part Go that hosted customers’ Node backend. I oversaw client SDKs in Objective-C, Java, and C++ and helped prototype the server-side SDK for Go. That’s not fatigue, it’s enjoyable and a skill I can offer my team. Sure I get rusty with a language, but it doesn’t take long to blow off the dust with a skill.