The concept of pre-existing condition should be abolished entirely IMO. Don't know what the legal status is though.
Well that's the whole debate, isn't it? Certain things cost piles of money, and they are often due to certain conditions. So if you force people to treat those conditions, then it costs money - and someone has to pay it.
The people currently getting paid for medical services want to keep getting paid (and, by and large, any reduction in revenue is going to be borne by the "average" worker, not the CEOs or lobbyists). People paying for medical services don't want to pay so much. People who are ill want to get treatment at the lowest out-of-pocket cost possible.
Something has to give.
I wish I had a good solution.
EDIT: I do have some "interesting" solutions, but they aren't really tenable. My favorite current one also addresses all the UBI nonsense. Basically from the Manna short story: Every person gets some amount of money every year (call it $55000 in the US). Every 12 months, their bank accounts get reset to $55k. No exceptions. So regardless of your job, position, what you buy, whatever - every single person starts with the same cash every year. Oh, and no loans allowed either.