I have this Side Trunk bag in Monogram canvas. It has the treated leather. Yes, there are still monogram canvas bags that continue to be made with the naked vachetta leather, as you mention here, including the speedy, and others. However some of the more expensive or limited monogram bags have the treated leather.I don't have any idea. Actually, I started talking to my CA about other pieces (which also have vachetta), don't know if they are treated. For instance the Mini Pochette, the Nano Speedy, and the Speedy 25, where you have lots of vachetta to worry about- treated or not.
Agree the dots look too busy at first but I really admire Kusama as an artist, and I find the twister dots whimsical. Somehow they appeal to the child side of me.