^ fair points made by JRinFL about adjusting grip or technique to allow for easier one-handed opening. I don't have a Swayback because the model does not appeal to me aesthetically (who the h3ll wants a knife that was designed backwards?! apparently a lot of people, so what do I know?
..), but I do have the Slysz-designed SpydieChef with the similarly sized thumbhole-opening/lockbar access cutout. I find it very easy to open and close one-handed using the innermost edge of the very tip of my thumb, rather than the pad or meat of the thumb. Is it as easy as a PM2? No, for sure it is not. It does it require a slight grip adjustment and a much more directed press of the thumb, but with some practice, it's really quite simple once you get the hang of it.
Another thing I think is worth mentioning is that there is that there seems to be so much emphasis being placed on the ease of opening, or "flickability," of knives being a more desirable characteristic these days (I blame the social media for this almost exclusively..). Since when has a controlled slow-thumb-roll become a somehow "inferior" method of opening a knife? Not every blade is going to rocket out with the subtlest motion of the daintiest finger.. such as the Slysz designs.. and, as far as i'm concerned, that is ok! Slow and steady seems perfectly functional to me and I certainly wouldn't want do discount a model that may be fantastic in other areas just because I can't flick it open with my weak-hand pinky finger! This isn't meant as a knock at you Michael, or anyone else.. I get that people like what they like and that's ok too! haha sometimes I start typing and just ramble on.. Anyways, as Sal always says, "All good, just different."
..well, that escalated quickly..