I found the brightness control info in the PDF.
If Deck were not so highly recommended, I probably would not have bothered to look there.
I suggest mentioning brightness and maybe modes in the descriptions.

How loud are they? Linear vs Tactile?

And why is there a suggestion area that is not monitored by staff... and why am I posting for that matter...

It's too bad because the Deck is the only keyboard that has good brightness, touch for typists, and the layout I like on the 105.