Thanks for the responses, FB. I hadn't seen your response when I made my second post in the thread - I guess the browser tab had been open for awhile.

I do understand that teeth on moder chainrings/cassettes are often shaped asymmetrically to improve shifting, and should have noted that in my initial post.
What stands out to me, particularly in the first and third pictures that I posted, is the consistent asymmetry (shark-finning) of the teeth. The right/forward edge of each tooth (that pushes the chain roller) is more vertical, and the left/rear edge is more slanted. That is the part where I wondered if it was normal/okay, or a result of significant wear.