When those politicians are up for re-election, it's fairly easy for someone to tabulate whether or not those goals were met. If there are extenuating circumstances (overwhelming opposition, for example), then they can use that to defend themselves. This would help hold their feet to the fire.
Oddly it seems like little to no Republican voters recognize that Trump never passed anything of substance. They also seem to not understand how the economy actually works, see that during a booming economy Trump ran up one of the largest deficits. Trump sought to get rid of major safety nets which lower and middle class tend to use the most and tend to also be the redest counties.
If you tabulate up all the pros and cons for the Republican candiate, aside from normalizing hate, all of the perceived benefits are just voters not paying attention in their civics classes in highschool. I don't think expecting voters to actually do their due diligence really works.
In 2019 China repeatedly modified their currency and rates causing world banks to believe they were doing it intentionally to gain trade advantage over orher countries.
In 2015 and 2005 they also devaluated their currency causing surges in trade and nearly caused a currency war.