Ah—like how if you glanced at caster-equipped fridge drawers, you might think they add $1,000 to the price of a fridge, because only higher-end ones have them, but if they were (for some reason) legally mandated they’d only add like $5-$10 to low-end refrigerators. But, without the mandate, no option for a $400 fridge with nice drawers.
Maybe not that extreme, but similar dynamic.