Alright, but wasn't the tab gesture also available on the holo era?
yes; but my point is that it reduces the available actions for no discernible benefit. it's not like they've added some spare buttons in the old place, like maybe bringing back the old universal menu button.
The benefit is less conflicting gesture triggers occupying the same area. A swipeable card/list-item has the entire card/list-card as the visible trigger. A Tab has the entire content as the trigger area. The Navigation Drawer gesture is an invisible area that can be placed on top of the visible triggers of other components.
maybe? i'm not sure about that though, as the hamburger button is on that side, and the drawer appears there; and i'd say "the edge from whence the drawer appears" is a lot clearer than "just any old fucking where", but maybe that's me
The issue is that the hamburger button is not the only button that can appear in that that place, a back button is common on that same area. The trigger area isn't the width of a button, but the width of a very specific button, and worse, it extends far beyond the edges of the button and shares the same height as the screen.
I do see your point that "anywhere" isn't an improvement, but I have to disagree, as that is fundamentally the same gesture to swap tabs, and you can predict the area trigger as being "just any old fucking where".