I've been using a blank Das Keyboard [1] at work for years. Besides all of the benefits you've listed, I've also found that it's the most effective deterrent for keeping people off my desk/off my computer that I've ever deployed.
I used a blank DAS to learn to touchtype. I now use a non-blank Kinesis Advantage2, but it has qwerty keycaps while all my devices are colemak so it has a similar effect to blank with the added bonus of confusing other people even more because the keycaps don’t match what is typed.
Ha, awesome. It makes me want to get some keycaps in some obscure language like klingon, just to mess with people.