Zend the organisation, is probably what Marco meant when referring to poor stewardship, instead of the OS project Zend Framework.
I like Hack because it explicitly doesn't support[0] a bunch of cruft from PHP. It feels a lot to me like the BC-breaking PHP.next people want - easy to switch to for modern applications, but not hindered by supporting PHP 4 code. Bit early to start pointing fingers at it's future though.