Well I've since realised I've been a bit thick. I'm cutting up meat about say the size of a big loaf of bread. I'm worrying about when I get to the 'heel of the load', that last inch. But I can make it a last 'two inches' instead and when I reach that point I can lay it down so it's now just one thick slice only two inches high.
And I can slice that until I'm down to just strip one inch deep and as wide as this imaginary 'loaf'.
Or I could stop that at two inches, too.
So now its a strip say four inches long and two 'deep' on the feed tray.
You get the point? That 'depth' enables the toothed clamp to hold it that's why I stop early.
And turning the remaining portion around enables me to slice quite a lot more. And those 'secondary' slices can be as wide as I choose to make them decided by when I stop slicing in the first place.
If I haven't confused everyone with my poor explanation it boils down to me seeing that one can 'use' the thing in different ways. Don't have to just push the material in the once way only until done.
There's the question of cutting across the grain or with the grain I suppose but I doubt that's important at all.
I am not at all convinced by the idea that the gap is there to save fingers. Such foolish people are going to push right up to the blade I imagine. Probably push harder when they reach the end of the tray because at that point the only thing that stops the portion falling is their push.
I guess they'd imagine (if such people do exist) that where they are pushing is back from the edge of the blade somewhere closer to the axis and they'd be safe. And they'd be pretty right at that, too, wouldn't they? It's not like they're approaching the blade edge-on.
I think I'll write to a manufacturer and ask him.
I asked GPT and it didn't know. Came up with all sorts of spurious nonsense.