Yeah, I'm not sure what you're talking about there. It's the opposite way around: traditional can openers create a sharp edge, and that's the whole reason for these side-cutters in the first place. I could easily run my finger down the edge of the lid after I've removed it with the Oxo. Not so with regular openers.

As for the liquid, no, you can't press the lid inward into the can. You can't press the juice out, but I have no problems draining the juice by holding the lid slightly askew from the top of the can. We do it all the time to make tuna sandwiches and tuna treats for the cats.