Horwath
Legend
Regarding the 4e-ish simplification. Beyond a 10-foot radius, a "circle" is the same thing as a square except missing its corner squares.
For Mind Theater the grid rarely comes up. But for occasions when a sphere on a grid does happen, it is simple to count the squares from the center, except for any last diagonal. It works well enough most of the time. I created a diagram to see what it looks like.
View attachment 303529
Good enough. The grid sphere is simple, and it doesnt come up too often.
I prefer it little more spherical