The physical menu button on the device DOES NOTHING in these apps. It's stupid - why not map menu to the hamburger menu? Or are they confused about whether menu should open the hamburger or the side navigation?
When I bought my TMobile G1 (yes, classic eh) it had menu, home, and back. Then, they introduced a "search" button on the HTC Desire and it lasted until the Motorola Atrix I had. Yet in that time, it stopped doing anything in certain apps.
After that, they completely binned it.
Now the buttons are being made even more redundant. I wish they would make their mind up and not rewrite the UI guidelines every Google I/O. It's STUPID.
I think this Samsung is the last Google device I will buy - now that iOS does split screen, I may jump ship (but I will miss this stylus). At least things run smoothly (Google Maps in 3D on a Samsung quad core is jerky and SLOW; it's worse on the 8 core).