I'm a non-native English speaker myself. My level is typically considered very good (C2 CEFR level, which is the highest measured level in the European framework). If I need to write an email to a colleague whom I know and trust, that's easy. Writing this message in HN? Also easy, I'm just improvising it as I think it, not much slower than I would in my natural language.
But writing an email to someone you don't know... that's very different. When you write in a non-native language, it's extremely easy to get the subtleties wrong: to sound too pushy about what you want, to make the matter seem more or less urgent than it really is, to sound too blunt or too polite... this doesn't matter with people you know or with strangers in an informal setting like this, but it does matter when emailing strangers in a professional setting, and it's extremely difficult to get right when you are non-native.
Sometimes I used to spend 15-20 minutes brooding over an email in this type of scenario, making and rethinking edits while hitting the submit button... not anymore. ChatGPT: "Write an email reminding this person, who has this role, that the deadline for thing X expires on day Y. The email should be polite, assertive but not too pushy". Check the output, maybe make some trivial edits, because the difficult part (the tone) tends to be fine, at least for my standards. Done.
Non-native speakers aren't going to renounce that luxury. It just makes too big of a difference to not use it in that case.