A couple of decades ago tax code transparency and making it easier and cheaper to file your taxes would have been a very Republican policy. Point taken that the current administration is particularly destructive, but I wouldn't expect Democrats to be very staunch in support this either. The tax/accountant lobby would influence both parties.
We've clearly had a more neoliberal congress body in the last decade. So their principles (or outright bribes) to focus on privatization of services would get in the way of such acts.
Tax return on a postcard is still in the Republican area of ideas, but they can't seem to get enough actual Congressional Republicans to come on board. It's frustrating. The problem to me is that the Democrats have become so uncompetitive in large swathes of the country, that too many center/moderates/status quos adapt Republican cover to get into office.
I'm sure Democrats can complain about their Senators in the same language.
