The tragic thing about Nader was his activism basically proved to General Motors and later large American corporations in general that political engagement and and public opinion was vital. The corpos learned to fight grass roots activism with astro-turf until they were just as skilled as Nader's acolytes, only with orders of magnitude more resources.

Every time I see an Oil company do a commercial about their commitment to the environment I think of Ralph.

It's not that it will work out good (though in a sense, it has for the R in that they got what they actually wanted), it's that if the Rs have ~50% ish support, no matter what they do, because of them going that route, the only way to beat them is to get everyone that isn't them in a coalition together.

Except Biden repeatedly gave in to pressure from his voter base on a lot of actions, we also got a lot of changes to DNC policy care of Sanders voter base. It's not ''do or die'' it's vote for an administration that will actually respond to pressure and voter's policy goals, or vote for a dictator backed by industralists who all want an ethnostate of uneducated second class citizens.

The problem is that the broader Democratic electorate is a much bigger tent, with overall much more moderate politics, than online leftists are typically willing to admit. We're still only eight years past an election where Hillary Clinton took the Rust Belt for granted, and we all paid the price for that when traditionally solid union votes swung to Trump because he was boosting fossil fuel extraction while Clinton implicitly threatened the livelihoods of families dependent on coal and fracking jobs.

Healthcare you have a point on, but also keep in mind that the last time Dems had the votes for sort of sweeping reform was 2008, and what we got out of that was the ACA, which for all its faults was still a big step up over the status quo. Obama was going for a big bipartisan win, in spite of McConnell's announcing that he was killing bipartisanship in the GOP caucus, and that was a mistake, but perhaps an understandable one given that up to that point that's how Congress had always worked.

There have been windows of time since in which Dems have held the Presidency and both houses of Congress, but never with enough margin to defeat a Senate filibuster, and with DINOs like Manchin and Sinema standing in the way of filibuster reform. I do not doubt that progressives in Congress would move an M4A or public option bill through the legislature if, in 2025, the House flips back and the Senate stays Democratic in spite of the unfavorable cycle, but withholding your vote doesn't get you any closer to that happening.