Then came the Treo... their smartphone. They reduced the size of the screen to 1/2 or even less of what it had been before, added chicklet-style keyboard ala Blackberry, and dropped the Graffiti written input.
Oh, you mean like the Tungsten C?
Now, finally, we have smartphones that match or best the Tungsten's color screen in size and resolution.
So I looked it up, and the highest-resolution Tungsten device was at 320 x 480 and now median phones are 720p, the display was only TFT and now phones are starting to be OLED, and the screen was 3.7" while modern phones are 4-5". The specs of the best Tungsten phone were beaten by feature phones some years ago.
We could have had that many years ago,
We did, and no, Palm's 3.7 inch display with almost no dots and also very few colors by modern standards was not comparable to a modern smartphone display. Not even a cheap one.