Indeed, I wasn't very clear. Let's put it like this: at one moment I decided to write all my posts in English. Lately, however, I started to think about the extent to which this is limiting. It's at least artificial, doesn't necessarily reflect me as I am elsewhere. So how about posting from one account in different languages? Whatever seems most appropriate for the subject at hand. Or even switching languages randomly in one sentence.
Like you, I don't see much of a problem there, with all the automatic translation aids. I just see few who really do it like this.
That's why I asked.