I would be highly in favour of reissuing puzzles that aim to assist in solving real world disease problems, like puzzle 903.
I skip the so-manieth issue of Scorpio Toxin, Insulin Mutant etc. because I see no value in putting my time to re-solving a known puzzle. Give us puzzles that matter please.
Thanks for your feedback, BP… it has been brought up to the rest of the team!
Just to be clear, though, we intentionally keep Revisited puzzles for many reasons… but one of them is to make it easier for new people who join Foldit to have an "easier" puzzle to tackle (as opposed to many challenging scientific puzzles). Revisited puzzles are somewhere between Beginner Puzzles and the harder Science puzzles.
Foldit has a steep enough learning curve that we don't want to just bombard players who completed the Beginner Puzzles with 3-4 tough Science puzzles.