I think there is something to worry about, but it's not 'unprofessional writing' or any kind of external downward pull, I'd say a lot of the problem is how much

I think there is something to worry about, but it's not 'unprofessional writing' or any kind of external downward pull, I'd say a lot of the problem is how much time professionals now spend in unprofessional contexts, even during working hours (he says, typing while clock-watching...). This is a post on someone's personal blog with some reflections on something they saw at work. I'm not sure why we should expect him to write professionally (leaving aside the question of whether swearing is acceptable in professional writing or not). I also wouldn't necessarily expect HN to only carry professional content - although some of what's shared here might be interesting from a professional viewpoint, it's not a portal for professionals (what even is 'hacker' as a profession? What percentage of the HN community are amateur hackers rather than professional hackers?). Ultimately, it's a discussion forum on the internet, where self-proclaimed hackers share things they think are cool, and if others think it's cool too, then it gets shown to more and more 'hackers' until not enough new people think it's cool enough, at which point it gets shown to fewer and fewer people.