We've had machine translation for a while and I don't think anybody particularly thinks of it as a bad thing? Writing something and then having a machine directly translate it (possibly imperfectly) is a lot different than a machine writing the thing.

Personally I would like people to try learning other languages more (it's hard but rewarding) but you can't learn every language ever, and it is really hard to learn a language to fluency.

I think it makes perfect sense.

But that a site might still want to discourage it, to avoid general degradation. It is a tradeoff.

If someone can write in the target language, just not well, a model could be asked to point out problems for the writer to fix. Rewrite a difficult sentence.