Regarding pre-existing conditions...
The "I could get screwed if I change jobs" argument is one I haven't heard before, and certainly has validity. But it could have been solved in ways that made a lot more sense. Some simple stopgap proposals.
I've had COBRA. It was a LOT cheaper than ACA.
Here's the problem...
A pre-existing allowance as it now stands ALSO allows people to avoid buying insurance until they have a problem. "Hello, insurance company. My house is on fire, and I'd like to buy fire insurance".
I am doing it RIGHT NOW.
I have 7 in my family. We are all pretty healthy (none of us have ever had a hospital visit or a broken bone). I am EXACTLY the kind of participant the ACA needs to to make the whole thing work.
But I can't. ACA is WAAY out of my budget, and I am left with the choice to have insurance, or food for my kids.
It's a pretty simple math problem. The fines are low enough that I have to choose to pay them, because there is no way the insurance thing is gonna happen. I live in one of the 10 poorest areas in the country, and the ACA insurances rates are the 2nd highest nationwide.
Besides, if any of us ever gets sick, I can go out and buy insurance. It's downright unAmerican, isn't it?
As more healthy people learn that they can't be refused, more will drop their current over-priced policies and roll the dice, like me. This will force prices higher. Rinse, repeat.
So, the system is designed to undermine itself. As more healthy people make the choices they need to and leave the system, prices will be forced higher, which will force more healthy people to leave.
Rich people don't need insurance. Poor people didn't need it before ACA, and could probably do without again if they had to (they'll just go back to the emergency room).
The people who ultimately get screwed are the middle class people who really need insurance.
It's just common sense.