John - I find your first statement to be quite arrogant and presumptive unless you have a personal relationship with the guys in the band. Because someone has a different opinion of a particular album or sequence of songs doesn't mean the person doesn't "get" the band. It means they have a different opinion. So let's toss the comment aside and from here we can have a productive discussion.
I enjoy listening to albums in their entirety (when worthwhile) and also enjoy picking and choosing songs Iike. If it is so important to listen to an album in its entirety every time then ask yourself the same question about why Radiohead mixes is it up at every show. Why didn't they just make me sit through King of Limbs in its entirety and in sequence last night? Because music isn't always meant to be listened to in the rigid structure of an album. It is also a collection of songs. A good one flows as a unit as well as a collection of individual pieces.
The great thing about Radiohead, and to answer your question about Gloaming and Myxamatosis, is they can play almost any of their songs live and sound great doing it. They are a great live band, as I already knew but witnessed in person last night.
They bring a wonderful live musicianship to their songs and they take the filler junk from the albums and still turn it into an incredibly engaging live experience. The worst and least energetic song they performed last night was Paranoid Android. Pyramid Song and Everything in its Right Place were delivered beautifully, but it doesn't leave me preferring those songs to Android on the album experience. It gave new new appreciation for the possibilities of those songs for sure.
Other than Creep I haven't seen any evidence that they shun their popular songs on tour. Karma Police has been played at half the shows this year. Android has been played more than that. Gloaming gets played but not any more than the others. They appear to enjoy mixing it up, which makes it fun, surprising, and enjoyable. This tour if you look at the distribution has been very heavily skewed toward material released post King of Limbs, stuff from King of Limbs, and In Rainbows.
I think they played 22 songs last night and a quick but not perfectly accurate estimate would be:
post KOL - 3
King of Limbs - 6
In Rainbows - 5
Hail to the Thief - 2
Amnesiac - 1
Kid A - 3
Ok Computer - 2
It was a great show and a perfect mix (with the exception of Exit Music, which is my personal favorite, being neglected)