I've never seen a ticket system used as just as dumping ground for data in auto-closed tickets. Seems like there would be better solutions for that, particulary for data you want to find later (in my experience, the search capability of ticket systems varies from poor to "don't bother, you won't find what you're looking for")

Anything else, that needs a human to interpret or take action on, yes, ticket systems get extremely wide usage.

That makes sense, but a part of me is wary of introducing noise at such a scale and drowning out whatever signal remains.

Also ticketing systems in my (very) limited experience tend to be bloated pieces of software, so that adds a fun dimension to it.