I understand in very broad terms the differences however in both countries is it not the Will of People expressed through their system of elected officials that should be respected? In the USA there is an impeachment process. Not sure what that process looks like in the UK. Or if there is a process at all that gives the PROPLE a process to deal with a government that is going exactly in the opposite direction that the citizens demand.
We know what this looks like in a dictatorship but in a system where leadership in government are elected by the PEOPLE it is within reason to compare how that process works in the USA to how that process works in UK or EU.
In the parliamentary system, the will of the people was expressed in electing parliament
impeachment is there for a Presidential form of government where the executive is clearly separated from the legislative. For the parliamentary system, the parallel is the no-confidence motion.
Parliament can vote no confidence in the PM
People can vote to recall their MPs.
There is a fundamental difference between the parliamentary and the presidential form - come on, you live in Canada, you don't vote for your PM directly. You vote for a seat and that determines the legislature that elects one of their own to be PM
In the case of Boris he was selected by the party itself - so analogous to as if Obama resigns in 2015 and not Biden but Buttgieg or some other Dem gets elecyted by the Democratic party as President. See - that doesn't make sense. Similarly one can't take the presidential form and push it over to the parliamentary