I would love if entries imported through goodreads, or created otherwise that don't have read dates provided to have one automatically created. It could be be the same as "I don't know" option that creates "?-?" Past Read, or just the same date as date added.
I wanted to move my book tracking to Hardcover, but its very hard to track book rereads, because i don't know how many times i've read a book, because "Past Reads" section is empty for imported books, especially when looking at old books imported vs the new manually added on the Hardcover site that have the "Past Read" section automatically included

additionally you can't just add "I don't know" as a reread when using "add new read" so it would be problematic to do it manually for every book if you have long history.