I honestly think that very few people here are completely non-conversant in English. For better or worse, it's the dominant language. Amost everyone who doesn't speak English natively learns it in school.
I'm fine with reading slightly incorrect English from a non-native speaker. I'd rather see that than an LLM interpretation.
...I'm not sure I agree. I sometimes have a lot of trouble understanding what non-English speakers are trying to say. I appreciate that they're doing their best, and as someone who can only speak English, I have the utmost respect anyone who knows multiple languages—but I just find it really hard.
Some AI translation is so good now that I do think it might be a better option. If they try to write in English and mess up, the information is just lost, there's nothing I can do to recover the real meaning.