For me personally, important reasons for switching from GPL licenses to Apache are: the Apache license I can read and understand; the GPL is vague in many point

For me personally, important reasons for switching from GPL licenses to Apache are: the Apache license I can read and understand; the GPL is vague in many points, leading to multiple interpretations; and license compatibilities between the GPL and other licenses (and between GPL versions/variants). Also, I don't want to force my ideology (I find FLOSS preferable) on other people, while still giving my software away. However, technical reasons such as the above were 50% of my license choice. Given the vagueness of the GPL, I can fully understand that many companies do not want to deal with that, even if they want to contribute to FLOSS in some way.