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It isn't insurance if the provider can't consider risk factors for the policy though.Insurers are welcome to consider risk factors... for populations in aggregate.
It turns their actuarial models into population-subset models instead of individual models.
Which is easily the most "fair" (to individuals) option.
Allowing insurers to consider individual risk factors (preexisting conditions, genetics, etc.) would make the advertising data mining industry seem quaint. And I don't think any American wants to live in that world.
So we can talk about whether insurers should be able to offer lifestyle incentives (yes!), preventative care incentives (yes!), and be backed by catastrophic reinsurers (like mortgages, maybe)... but enrolling people blindly is one of the best things ACA did.
(Unless one happens to be young, rich, family-less, healthy, and have no moral compunction about fucking others over for ones own benefit)
Also, important unremarked benefit of ACA -- capping maximum insurer "administration" costs.
Firsthand from inside the industry as it was implemented, I can tell you that drove efficiency improvements inside insurers, as they couldn't bill for broken, slow, manual processes in additional premiums.
Granted, it caused other problems (attempts to self-deal and harvest profits through quasi-related provider / pharmacy entities or Medicare Advantage), but it did focus insurers on being efficient facilitators.