I'm confused by your comment. Your main thesis is worded as though it applies to all U.S. political groups, but the rest of your post seems specifically anti-Republican.
(Which would be ironic, but I don't support either party.)
Same could be said about taking a more piecemeal and less legally inventive approach to healthcare reform back under the Obama administration. They passed exactly as much as they thought they could squeak through the legislative process. A plan with 2/3 consensus could have been pursued but they decided to burn all the political capital they could instead. Enter Trump shortly later... a "fighter".
Unfortunately "control a majority of the branches of government" isn't enough to get legislation passed. You need control of house, senate, and presidency. The senate is particularly difficult because of filibusterers, so you need 60% votes, not a simple majority.
[1] https://www.skynews.com.au/world-news/united-states/former-p...
The opposition also becomes saboteurs because any wins they give the ruling party means the ruling party gets to look better, and hell no, we can't have that, we have to destroy them!
Funnily enough when lockdowns started, the billions of bailout got bipartisan support. It seems like both sides knew a hungry populace would go for their heads, whatever the label after their name is. EDIT: then again, Dems are a more conscionable bunch (which makes fighting against a win-by-whatever-means-possible bunch hard), they knew people needed the money. The hypocrisy was GOP saying money doesn't grow on trees, until it does...