Except we had exactly those things before and what you're describing did not happen. Presidency/Senate/House during Joe Biden's first term, during Barack Obama's first term, even Bill Clinton's first term. We've given them every opportunity to carry out their promises. Other than passing a stripped down version of Obamacare, they have sorely underdelivered in any direction.

And I maintain the reason for this is very simple: Democratic Party Leaders care only about themselves.