LLMs bad¹ ² ³ ⁴
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¹ when they empower idiots who vibe features with no regard for tech debt
² in a long run when they are used without human oversight
³ even on trivial tasks when results can't be reliably verified (f.ex. tests coverage)
⁴ the above list is not exhaustive, but outlines main points which should be easily recoverable (by any person smarter than a house spider) from the context of discussions involving LLM sceptics.
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To answer your question "where" – take this as your home assignment. My message contains enough hints to come to the right answer.