HN guidelines forbid changing the title. I proposed changing this once, but the post didn't get traction. There was more traction for that years ago though. https://news.ycombinator.com/item?id=26300126
I often change titles on submissions. Making them shorter for instance. I also do change some to provide more context that the original source didn't.
An article has only 15 minutes in /new to attract enough votes. Sticking with a crappy title nobody will click on wastes everyone's time. Obviously don't go full clickbaity.
It's more nuanced than that. See https://news.ycombinator.com/newsguidelines.html: "Please use the original title, unless it is misleading or linkbait; don't editorialize."