As an ESL person who has spoken English as their main language for two decades now I find this very interesting. The vast majority of my English has been spoken with my wife who used to be a marketing VP or in a professional context. Sometimes people complain about the ways politicians or corporate executives talk and I don't get it and to me it sounds totally normal because that's what I'm used to. Makes you wonder how ESL speakers will sound more and more like LLMs because that's a large part of their exposure.