The point is that apple don't want to update bash because they don't want to ship software that uses GPLv3 but they also don't want to keep shipping a decade ol

The point is that apple don't want to update bash because they don't want to ship software that uses GPLv3 but they also don't want to keep shipping a decade old version of bash as the default shell, they aren't doing this because they want to improve on bash or anything like that.