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I'd say the advantage is less on the architectural side and more on the team efficiency side – you could possibly have a full-stack team that only needs to do most of their work in 1 language. The benefits of easing task-switching could make it worthwhile as a stack choice.

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The thing is that for anything more complex than simple CRUD either side (frontend and backend) is such an inherently different problem domain that I don't see that the programming language is the relevant factor.

Because frontend and backend need a very different skillsets and both need a lot of knowledge and training to become good, there are very few true fullstack engineers. And I would bet that most if not all of those can handle work in multiple different programming languages.

Sure, but that's being positioned as a "huge advantage" vs. JavaScript, which I hope I do not need to explain to you the irony of

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