You don’t need to be progressive to understand “free healthcare”, and “free healthcare” polls better than “subsidies for insurance companies”. “Free college” polls better than “means-tested forgiveness for STEM grads who operate a business in an underserved neighborhood for 5 years”. The great thing about left policy is that you don’t need to trick people or gauge people’s political positions and try to match them against a 5 dimensional chart, you’re simply using the tools available to improve people’s material conditions and people will vote for it because the alternative is immediately worsening conditions. Look at europe, public healthcare is so popular even the conservatives need to pretend to support it.
Dems could have simply gotten rid of the filibuster and passed free healthcare with 50 votes, and shown an entire generation of voters that politics is a viable means of achieving positive social change. But they genuinely do not want this because the donor class does not want this, so they let the rules stop them.
For the dems, a generation of energized, politically active 20-30 year olds is a problem to overcome.