Honest question: Why browser's integrated password managers (such as chrome's) are not considered an option for most companies which ask you to use 1password, e

Honest question: Why browser's integrated password managers (such as chrome's) are not considered an option for most companies which ask you to use 1password, etc? Taking out of the equation that maybe google can read your passwords... from the endpoint/laptop point of view itself, is it any less secure than those 3rd party password managers? My understanding is that, for example on OSX, they store them in the OS keychain anyway, right? What's so wrong with that?