I too miss Andrew here even though I've had a few knock down back and forths with him. That sort of thing doesn't annoy me though as I learn much more that way. I think all of us do if we think about it.
His videos are quite good and he does a good job explaining what he is doing. Probably a result of tuning his pedagogical technique from all the training he does. He makes a real contribution to getting high quality color management to large numbers of people.
The Schewe softproof video here is sort of folksy and, I think, uses a more realistic image. It should appeal to, and be more effective with, serious photographers without going as deep in the weeds. Andrew's image of choice for evaluating profiles is really good for those images with colors that are extremely out of gamut. The one with the balls and fish on a blue tarp for instance. An analysis of the colors in it (ProPhoto RGB) shows a large amount of the ball colors are imaginary (outside the human gamut) and many of the colors on the images are outside of the Macadam gamut, which is the theoretical limit of any reflecting surface. Needless to say printer gamuts are well inside that.
Since I really don't do much work with such saturated colors, how a profile performs on these isn't of much interest to me but I can see its value to others. Especially in showing how different profiles map out of gamut colors.
My main interest is in the smoothness of printing for in gamut colors. This is where most of us work day to day and sudden non-linearities in color gradients because of profile or, worse, printer error is a full stop if bad enough. There is precious little about this that I have found anywhere and it would be a particularly valuable thing to measure when reviewing printers.
My reference images of choice are the old Kodak Photo Disc and the Roman-16 set. The latter skirt what printers can do but the colors are all real and within Macadam limits.