Ahhh.. wouldn't that be better by using a percentage of filler words/total words in title threshold?? I don't know if a feature simply strips out the filler words in title, it's not always useful and rather harmful is what I would argue.
Humans work better. HN is small scale enough that a moderator can come along, collapse the off topic comments and fix the title, and it's not an issue.
Seems like title cleanup is a good use for an LLM actually. (Not to remove the human option, but as the first smarter pass instead of simple stopword lists.)
IIRC, if the original submitter edits the title once it has been posted, the edited version sticks, i.e. the filter only works the first time and you can override it if you notice it.