The preview pictures, a.k.a. thumbnails, generate a few minutes after the recording completes.
It requires a tuner to be available, and takes around 4 minutes for each hour recorded.
Granted, the thumbnails make it easier to zip thru unwanted commercials.
However, the fast forward, and rewind features go forward and back in standardized increments, and along with the timestamp, it’s easy to learn how far to go in either direction.
I don’t think they expect customers to do anything.
However, I do appreciate customers sharing their knowledge, experience, and humor.
I disagree.
They are creating enhancements based on customer requests.
True, they are not creating them fast enough for everyone.