Just went from a Mini 5 to a Mini 6 and simply don't have any noticeable or objectionable screen deficiencies. The 6 is better than my 5 was, I did compare them side by side before trading in the 5. This whole "jelly scroll" panic is pretty amusing to me. I'm sure there is something there as it is the nature of the technology in use. But every single time a new Apple product is released there is this incredible rush to find every minor flaw and declare it a disaster. Go back and review the posts when the M1 laptops were released and look up the "disk write problem".
I mostly read this stuff for entertainment value, a study in how anecdotal reports can become scandals propped up on very little hard information. In this case a display does what all other similar technology displays do. What an outrage!