Regarding pre existing conditions, you misunderstand. I'm not suggesting a subsidy, I'm suggesting a reset to 2008. If people had insurance then, they should have some path to get it back. You are inadvertently advocating a massive government giveaway to insurance companies - it is classic crony capitalism. People had long term contracts with insurance companies. Obamacare broke the contracts. If you don't have an Obamacare replacement, the insurance companies are gifted new leverage to renegotiate over individuals.
I’m not advocating for the retention of Medicare and Medicaid. I’m acknowledging they will exist with the repeal of Obamacare.
As for resetting for preexisting conditions per 2008, first it isn’t feasible. Second, even if it were feasible, a government mandate to force some insurer to accept is a de facto subsidy by those participating through the same insurer who do not have the conditions.