Everything you have listed as some sort of fault of the Dems is actually caused by R obstructionisms.  All you have to do is look at parts of Europe, Scandinavian countries, Iceland etc as examples.  The dems for years have supported and tried to pass things like education, health care, social safety nets, and on and on it goes.  sometimes they get lucky and get some sort of watered down version of what they want (ACA for example) but usually its shut down by the minority authoritarians (voting rights, build back better to just name a couple of recent examples).  Sure the Senate D's "could" kill the filibuster, but that also opens the doors for gods knows what kind of bullshit modern R's will put forth in the future.  Our society, government is broken and instead of looking at the causes of the problems you blame the D's who, despite their percieved faults actually try to put forth good policy.  Go ahead name a good policy put forth by the R's in the last 20 years that wasn't a tax cut and that actually helped the people of this country...i'll wait...