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They issued a security update within 24 hours of the cve, and > 99% of users had it within 48. That's what we need to happen.

Until you need to define static routes and realize it's not possible on the Apple routers (happened to me this week).

Is there anything out there that is already perfect and should not be improved?

I feel like asking "what kind of updates" is too vague a question to reasonably answer.

Yes, updating any software adds some risk of something breaking. This is not unique to OnHub. This is still a pretty nice feature for most people.