This doesn’t really make much sense in this context though.

All iPhones have the feature built-in by using the camera’s flash LED. Androids have the same camera flash LEDs, but the software side simply doesn’t use them for this purpose. There’s no “cheaper production” here since the components are already there. Dedicated notification lights are gone, but the flash LED is efficient enough to serve the same purpose these days

Pretty sure you can still enable the flash LED on Galaxy phones under accessibility but I don’t have one to check - not sure about other android phones but I’m sure there’s a third party app that does it anyway.

iPhones use the camera flash LED for this exact function, no reason Android phones can’t do the same.

Some elevators.

All the ones near me have fully functional close buttons.