I think that they keep getting these Fn layers so wrong. The original Poker was the closest to getting it right. The great thing about the Poker's Fn layer was that the Fn layer arrows keys were more convenient than dedicated arrow keys. Arrow keys as well as Page Up/Down, Home and End should be near to the homerow, either on the homerow itself, as inverted Ts, or one towards the middle like Vim's HJKL style where you don't use your pinky. Then you can just hold an Fn key placed to the side of the spacebar with your thumb and move around the cursor without having to move your hand away from the homerow.
The HHKB also annoys me because of this. To get at everything on the Fn layer you have to shift your right hand. I guess that the "problem" with this new Poker 2 or Pure Pro, whatever it is, is that instead of trying to appeal to the "efficiency" people, they are trying to appeal to the "compact/minimalist" people. I'll be sticking with my original Poker, though I might have to get a GH60 so I can finally get the Fn layer that I'd like.
Edit: Just for fun, here's my idea for a 60% Fn layer from another thread (only the markings on the 33 inner 1x unit keys and spacebar are Fn layer):
I liked Turbinia's embedded numpad idea, but didn't like constraining the 789 to match those on the number row, preferring to keep the F# keys there instead and your hand on the homerow. Period and 0 are easily reachable by the index finger, + and - by the pinky, divide and multiply are less common so are a bit harder to reach. Fn+spacebar for enter is useful both when using the numpad and during normal typing.
Arrows are on ESDF (the equivalent of WASD, but in homerow position) and Home and End easily reachable (think how often you use Q and E when using WASD in games). Page Up/Down are on the two keys that the left index finger can reach easily. Backspace is on homerow and delete is where it is on the Poker, it's position on the Z key reminiscent of "undo." The idea here is you press right Fn with your right thumb and keep both your hands in homerow position. This is more efficient than dedicated arrow keys in the bottom right corner, which require you to move your hand.
Left side Fn key being where caps lock is allows you to use the arrows with one hand if you need, and lets you use the embedded numpad comfortably. Alternatively, you could swap it with control, but I think it's better where it is, and control wouldn't be used as often as Fn would likely be. I personally like left Windows as it's useful for Win+# to launch programs, Win+R, Win+E and Win+D notably. Alt Gr replaces right Windows for those who need it for special characters.
Tilde can go where right control would normally be, as I don't think people use right control that often. That lets Esc be in the top corner as expected. Insert, print screen and pause/break can go wherever you like.