Hit the same wall last year and made the switch too. The big grid was mostly decoration for me, I flipped past it without really reading it, and the weekly page keeps me honest because everything I need is right there. Still keep a small month view taped inside the cover for the stuff that's weeks out, but the weekly layout made the day to day way simpler.

Small thing but the plates test is not really grading how well you see color, it is screening for color blindness. There is a big gap between passing that and being able to notice a 2 percent brightness difference between two grays. Passing means you do not have a red-green problem, it does not mean your eyes are a good tool for contrast. Which is kind of the point you landed on anyway, an eye doctor checks for eye health and disease, not whether your body text passes WCAG. The checkers are doing a different job than he was, so trusting them more is not really a knock on him.