Thank You!
about "the darkish blob":
a dark blob under them was needed to visually untie the image from the background - this gives it more volume (not flat) and prevents the influence of background graphics on the main icon.
It was a atavism from the old interface and for the new exel-style, of course, was not needed.
In my opinion - they are just "undefined" - the brain does not immediately recognize these images - not enough color information and they are oversaturated with small minor details that do not add, and clog the overall impression of the image.
Form - hasn't the recognizable contours. And contours - it's what is perceived by the human brain in the first place.
To clarify what I'm talking about, here's an example:
What image tells your perception that you unmistakably see "goldenrod"?
View attachment 28561
this is an exaggerated example, but i want to say that the new icons have similar problems.