I think the political system and the disenfranchisement of voters has been the clear difference in the second half of the 20th century between social democracies which have succeeded in reducing inequality and those which have failed.
Ultimately the way we vote for people and the governments we end up with as a result are the least trivial aspect of politics.
Who cares about discussing issues like the economy or immigration, or equality, or any number of foreign policy decisions.
Ultimately only a third of the population are getting their choice in power at any given time under FPTP. There’s a winning minority, a losing minority, and a minority with no chance of someone to vote for gaining any power.
Divide and rule by those wishing to suppress democracy. Usually for monetary gain in corruption or avoiding taxation.