I only speak English - but I’d love to develop my knowledge of other languages. I can speak the bare minimum of French needed to order a pain au chocolat.
The issue is, learning another language requires complete immersion if the learning is to be effective.
I wouldn’t be opposed to seeing more posts in other languages and it would give me a reason to look into the language being spoken a little more. Having to work across language barriers is a great way to develop your skills in another language in an immersive way. We’re not doing international business valued at a couple of billions of dollars - so it’s not like it’ll do any harm. Sure, there’ll be mistranslations and miscommunication - but that occurs in English anyway.
Just my deux cents.