It's wild that you think strong democratic majorities will pass laws that help the working class when there are several states where this is the case and they don't pass significant redistributive social policies.
Why can't democratic trifecta states right now pass $25/hr minimum wage tethered to inflation? Or state run universal healthcare? Because their donor base is also composed of billionaires and cadres of business owners. What's more after a few cycles in office, they routinely leverage information asymmetries available as part of their supposed oversight roles to make money in stocks, become exceedingly wealthy and more detached from the needs of working people.
The Democrats have exclusively run pro-business national candidates for the past 35 years. It's naive to think without serious pressure from the Left (whether that's internal DSA pressure or something else) they'll put forward policies that actually help the working class. If someone doesn't want to be in your big tent with AIPAC, pro-business sycophants you portray them as ideological purists. Unreal.