This is a question strictly out of curiosity.
Since Unity was 'discontinued' there has been very little globals menu's around. I know KDE has one that does not always work, and Ubuntu Unity say they have some issues with Thunderbird which stopped support because it was difficult (supposedly).
Why is that exactly? I have never found any actual articles on the topic.
I read something online somewhere (at some time :p) that gnome programmers thought the code was ugly.
Is it not done because there is little agreement on how it should be done? Or is it just a general disinterest to have a global menu.
Really just curious :)