> it often seems that more cars is taken with mastering
I know this was a typo, but tools like https://shop.audified.com/products/mixchecker (with a literal "sedan" button) and articles like https://ask.audio/articles/the-final-mix-using-your-car are sadly indicative of the emphasis in modern mastering on sounding good on car speakers - which is the entire problem in a nutshell.