Do other people react as strongly as I did to the lack of capitalisation at the start of sentences? The post is generally "well" written with good grammar and punctuation so I find it strange - it feels like a style choice. But the style choice just instinctively makes part of my brain feel like it's written by a child.
HN guidelines has this to say about contents of your comment: Please don't complain about tangential annoyances—e.g. article or website formats, name collisions, or back-button breakage. They're too common to be interesting.
The HN mod team may find it not to their taste, but they don’t get to decide what is or isn’t generally interesting.