As an American I find it absolutely hilarious that you went off half cocked listing a bunch of issues that are of second and third rate importance to most Americans.
Most Americans want the feds to make minor policy tweaks that will make their lives better, more healthcare, federally, minor financial tweaks, fund some things a little more, fund others a little less, minor procedural tweaks on certain government things.
The average American won't get any of the policy tweaks you mention without fixing the most glaring issues of my list since almost everything federal requires at least a full congressional majority.
Reagan and Bush Sr. had none of eight / four years, Clinton two of eight years, Bush Jr. four of eight, Obama two of eight, Trump two of four and Biden at least two of four. And even when the respective Presidents had a majority in Congress, they would usually require not just ordinary majority but filibuster-proof majority in the Senate - and the last president to enjoy that one was Jimmy Carter in 1977-1979.
Every Western country except the US and UK has a system in place that the leader of the government usually has the majority to pass laws in parliament, at least a budget law, without depending on the opposition - we do have some countries that love their minority governments, but even they manage to do just fine. Something like "government shutdowns" resulting out of the legislative chambers being unwilling to do their most basic job of ensuring the government is actually funded is completely unheard of here - and you Americans have had ten of these since 1980 that resulted in furloughs and eight more that did not [1].
The UK does in fact have such a system (unlike the US). We use first-past-the-post voting, like the US, but our Prime Minister is selected by the majority in Parliament (rather than directly). Consequently, we don't have 'cohabitation', where the PM and Parliament are of different parties (which can happen in France and other Presidential systems), and it's quite rare to have minority government, where the PM relies on the support of other parties to govern.
Having said that, our system is like the US in that our parties are strictly oppositional and have no real history of collaboration. So when there is a 'hung parliament' with no majority (like in the run up to 1979, and during the second May administration from 2017-2019) then you tend to get a disintegrating administration rather than the kind of stable coalitions that are the norm in other European countries.
MMP elections, or STV with multi-member districts, result in a broader diversity of parties being elected -- not just two opposing parties.
This allows coalitions to form around shared interests, and results in 1) politics being more representative of what voters want, 2) more moderate politics avoiding wild policy swings, and 3) politics being more constructive.
It really gives a huge quality improvement of politics moving from a binary to a plural system.
Most Americans want the feds to make minor policy tweaks that will make their lives better, more healthcare, federally, minor financial tweaks, fund some things a little more, fund others a little less, minor procedural tweaks on certain government things.