Because otherwise the insurance companies can just look at your completely maintained roof that will last another 20 years and ask for a full replacement because it is 10 years old. And if you don’t comply they will drop you. (Happened to me)
If we mandate that insurers keep premiums equal for everyone, get ready for a lot of people to have zero access to insurance as they're deemed too risky to cover.
So someone with cancer should be charged $20k/month then? I am completely healthy and haven’t used my insurance much in the last 10 years. Why are my premiums so high? And why are 65+ year olds not footing most of the bill? I am not advocating for that but just pointing out that were obviously okay with charging for some risk profiles but not others.