Why isn't that done in the US too? Why would a new administration put the problems created by others under the rug?
It's not that it's a deliberate thing, per se. If you look at the boom bust cycle of the US economy, it's not actually especially related to who is in office, or any particular fiscal policy, and to the extent these things impact it, the effects are felt years later in many cases:
So, like I said -- our electorate on the whole is not especially well educated. If you receive a typical US 12th grade education, you get some mix of science and propagandas of one kind or another, and then what you learn in higher education, if you even go on to pursue that, is sort of dependent on what you're trying to learn and the degree to which you're trying to challenge your existing biases.
The typical voter has a pretty good grasp on how happy they feel
right now, how their finances compare to a year or so ago, and what their long term savings balance is (often a two or three digit number, unfortunately). They don't have much of a grasp on specifically what economic policies are responsible for them having done "better" or "worse" in a particular year.
The economy, like the power grid, is so vastly complex and full of undocumented feedback loops, that the people who study it professionally full time often lack consensus about how particular aspects of it operate. Given that reality, it's no wonder that the kind of financial data average citizens use to base their votes on, is detached from reality.
"My income and long-term savings value has generally [increased / decreased] over the last [ 2 / 4 ] years under the auspices of [ dominant political party ]" is a very easy sentence that anyone with even a rudimentary grasp on their finances can fill in the blanks on. Unfortunately, it leads one very easily to conclusions about the effectiveness of the fiscal policies of [ dominant political party ] which are super inaccurate, because if you want to really understand the impact of any one policy you need to have enough data to trace it through at least one full boom/bust cycle that followed it, which means that it takes a minimum of ~10-15 years to see policy changes play out.
This is obvious to policy wonks, but again, the average voter isn't a policy wonk because mostly people are forced to spend their time playing the rat race game of "how do I keep the lights on in my house
this month?", and many people who should
not be in that situation based purely on income, still are, because of the effect of "keeping up with the joneses" and mindless consumerism.
Note: I'm an unapologetic mindless consumer. That's why I let my partner decide how much of our cash goes into mindless consumerism vs savings
I am not, personally, any smarter than the average idiot but fortunately I married someone who is.