flatten all premiums
Well, to go back to basics, if insurers based their premiums on micro-grained risk assessment so that they could get an accurate risk for individuals that would wipe out the need for insurance - because all you would be doing is paying into a savings account against a future event PLUS a hefty profit to the insurer to manage it. Which they do anyway.
Surely, in an idealised world, for a particular class of events all premiums should be identical and the risk spread evenly across the board. People who took the piss (i.e. acted recklessly) would fall afoul of the small print and the rest would have a shared pot to actually benefit from when things went wrong ?
Other things which could be useful to help us pick a "good" insurer (no such thing): Require insurers to publish audited figures of claims - how many amde and how much for, how many refused, average and std dev of processing times, complaints (that's already published I think) and so on.