you will have more teeth cutting on the down stroke
It’s only ever the teeth on the “down stroke” that does the cutting on a bench saw, by the time the timber reaches the “up stroke” the cut has already been made. Unless of course you feed it from the wrong side of the bench saw.
And there won’t be more teeth cutting – the saw blade will have exactly the same amount of teeth it started with, however much you move it up and down. Feed it slowly if you want to use more teeth to do the cutting.
Of course in the case of a handheld circular saw the opposite is true, ie, it’s the “up stroke” that does the cutting while the “down stroke” does nothing, which explains why the underside of ripped ply is always more splinter free than the top side.
As for my personal digits qualifications is concerned**, I have 8 fingers and 2 thumbs, but only just – I almost lost my left little finger on a bench saw. The first I knew of it was the blood spraying off the blade into the air, I didn’t feel any pain (that came later). Luckily I was moving my hand very slowly (I won’t go into detail) so it just cut the flesh and only 5 stitches were required.
** To be fair I’m a site carpenter so I only have the limited experience of working for short periods in joinery shops, mostly providing support.