While I was considering it saw some other Logitech keyboards that had a knob for volume control/etcetera, which I feel like it would be a much more sane approach regarding the low profile aspect than this 'rotary encoder' thing. Also, as someone said, some lateral buttons would've been awesome.
I like this design (though I feel like the typography choice was terribly unfortunate) and I can see the appeal for the low profile. But also agree that home/end/pgup/pgdown keys are a must.
Though for some reason when I tried the Bluetooth connection with the Mx keys it had a noticeable lag for each key press, versus the instant response with the propietary wireless connection with the dongle. However the usb-c alternative connection with this one seems like it's a great thing to have.