I saw [Paul's] writeup about landing gear up and the conversation about ideal trainers. To be honest, I did not follow the whole Diamond aspect because that is not a plane I have flown (although I do have 150 types in my log). But I did want to comment on your question about the value of learning to fly a Cub or other unstable airplane in the world of automated airplanes.
This is a companion discussion topic for the original entry at https://www.avweb.com/features/reader-mail/top-letters-and-comments-december-20-2019