I just gave my son a LM Wave (the new version) as a gift for earning his First Class rank in Boy Scouts. Here is my take on its fingernail friendliness (FF):

As mentioned, the two main blades open on the outside (no folding required) via thumb holes. One of these blades is plain-edged and the other is fully serrated. One cool feature is that the outside edge of the serrated blade is slightly notched so you can tell which side is the serrated blade just by feel. These are both very FF.

The saw and file are also on the outside. They open using fingernail pulls that are at the very ends of the blades. This gives them maximum leverage which also makes them very FF. If, for some reason, my fingernail was cut extremely short or missing, I find I can just barely catch the fingernail pulls with the fleshy part of my finger and not use the nail, but it isn't very comfortable.

Now, opening the handles gives access to the can opener and large screwdriver socket on one side. The can opener uses a classic fingernail groove, which is pretty smooth. The large socket uses a fingernail tab that is not nearly as smooth. I find is fairly easy to get it just a bit of the way out and then pinch it with fingers to pull it out the rest of the way.

If you go to Leatherman.com, go to the Wave, and then place the cursor over bullet III, you can get a pretty good look at the classic fingernail groove on the can opener and the little fingernail tab just opposite of the can opener's "hook".

The other side has the flat screwdriver blade, the mini socket, and the scissors. All three use the fingernail tab and they all behave pretty much like the large socket on the other side. I find it easiest to pull them out just a bit with my fingernail and then pinch the blade between fingers to pull it out all the way.