Title, description, canonical, robots directives, headings, structured data types, word count: those are the fields a change to which is worth waking somebody for. Everything else about a page can change every hour without meaning anything.
It also keeps a promise about storage. We do not keep yous' page text, so the hash and a word count are what remains of a page after we have read it.
Try it on your own site, free
No card, and the free tier does not expire — the first verdict takes about six weeks to arrive.