I have been researching cassettes and gearing since joining BF in late 2020. My very first post here was about building an 11 speed Frankenstein cassette from two Ultegra cassettes: Bike Forums - View Single Post - Custom 12-28 cassette.

Somehow there seems to be a significant difference moving from 10 speed to 11 speed. In the 10 speed universe, no one had issues with Miche cassettes, and people were successfully building Frankenstein cassettes by combining two Shimano cassettes. From what I can gather (from my ultimately unsuccessful quest), the individual cogs in a Miche cassette are designed to be mixed and matched, so they may not have shift ramps that are aligned between adjacent cogs, the arrangement in other cassettes in which the set of cogs are designed to be used as a single unit.