There is no (in the forest) way of looking at an SI card and checking you punched back at the previous control, as opposed to Emit V3 where you can (as long as you understand what the hell it's telling you which took at least 3 races), but realistically the only point you're going to check this is just after leaving the control and only if you weren't sure you punched properly. If you're not sure then go back and do it again! SI doesn't have a LCD because of two reasons: size and no battery in the card - both of which I see as good things.
The paper card backup is nearly useless. As a programmer myself I can see why this was engineered in - as a fail safe in case the electronics went wrong (we have such faith in our own abilities - not). Now they're proven we should remove this. Half the times I've used Emit the paper card wouldn't have been readable in case of electronics failure. Also I keep punching my finger on the spikes

For the record I don't dislike Emit - I quite like the LCD display now I understand it. I'm just stating the other side. There seems to be a perception that SI isn't fit for purpose because one of our elites got DQ'd for punching too quickly. If it was Emit out there then maybe he would've got DQ'd anyway - if one is going to punch that quickly then one wouldn't insert the brick fully and maybe one wouldn't read the screen. There wouldn't be the contreversy though as there would've been no way of proving he punched too quickly.
As for the new rule - I don't like it, although I see a contradiction allowing you one sloppy punch on a manual card. Video evidence of being there cannot be fair unless that camera is on for all competitors, so esentially we're saying it's an SI specific rule which is a bit odd. I say leave the rule like it is and hopefully this will serve as a warning to other competitors to punch properly. I do think orienteering should be about getting round from point to point in the fastest time and not get bogged down in the technicalities of electronics, but unfortunately this proposed rule gives more technicalities not ironing one out.
Personally speaking I have been DQd with manual punching having been to all controls (although fortunately never at a big enough race to worry about it), but never with either of the electronic systems. We're a massive step forward depsite such technicalities.