The poster mentions issues with Notes and Freeform. I use these apps with an Ipad Mini 6, and suffer from freezes, latency, high power draw and crashes. I was previously considering getting a more powerful device like an Ipad Pro, but according to OP this won't fix it at all.
Paraphrasing a redditor, the Freeform app seems to have been developed as a demo tool to use in Apple Stores.
In theory, there should be some sort of paid app that uses all the incredible hardware for an actual good experience.
In theory, there should be some sort of paid app that uses all the incredible hardware for an actual good experience.