I would go as far as saying that attaching a generic, AI-ish cover letter is a) disrespectful and b) far worse than attaching no cover latter at all.
It's disrespectful because it's essentially a fake/empty message (often a regurgitation of the CV) and a bet that the receiving side will be dumb enough not to notice.
I occasinally use cover letters to highlight super specific things that called my attention or that make me a particularly well-suited candidate.