Exactly. If nothing else, writing a solver in Python or Java might take dozens or hundreds of lines more code than Prolog, so simply knowing what tools are best for what jobs helps you be a better developer, whether you're using a compiler or an agent.

Sure, but that's about thinking and describing in more high-level English, not individual programming languages. That era is over.

Advice to juniors (say) to spend time learning multiple programming languages over good command of a single one, deep expertise in LLM use and basic software engineering principles is going to severely undermine their value in an already tough field for entrants. For seniors there will generally already be a reasonable grounding in multiple paradigms; delving much further into legacy manual coding styles is going to see them leapfrogged by experts in modern (ie AI-assisted) approaches.