Yes all those options work. But why remove a common method of navigation? In addition, the format makes it impossible to search for text within the presentation.
Because it wasn't 'removed', rather it wasn't 'created'. You seem to be missing that supporting this feature is extra work and not 'built in' to the way the project is constructed. The author didn't sit there and say, well, fuck the wheel, I'll just throw in a line of code here to disable it, just to piss people off.