Do you mean export the whole problem set from chess.com, fix them (somehow), and give them back to chess.com?
Try To Solve These Annoying Puzzle Rush Puzzles (mostly easy)

That would probably take too much work. The nice thing about flagging is it (hopefully) would let you focus on the "best" subset (what's "best" to focus on would have to be figured out).

You are spot on with this llama44, but how would you fix it? You could allow users to flag things like "needs more moves", "needs fewer moves" or "needs alternative move" . The problem is that then chess.com would have to spend time acting on this info and modifying the problems - and as you pointed out, they're running a business and their time costs money. Perhaps a group of volunteer chess.com members could do this work.
imagine if one were pfren. a wrong move triggers a popup of his mug with a cartoon-like bubble of him saying, "you suck!"
@llama44:
I found the perfect example puzzle: https://www.chess.com/puzzles/problem/260727
Unfortunately I can not reproduce the solution, because there is something wrong with the way it is in the database. It does not show any moves. May be it does for you? I'm just a guest member. I've seen this issue with many puzzles, so it's not unique!
There is however a clue in the list of themes on the right. One theme is "mate in 3 +" which backs up what I write next. The preliminary move it played was 1. Qe2. I played black and the solution went: 1. .. Qf2+ 2. Kh1?? (loses a queen while Qxf2 only loses a rook) Qxe2 3. Rxe2?? (permits checkmate while it could have "resigned" and Rg1 would have held on for a while). So this puzzle plays both an inferior defense and permits an avoidable checkmate though they are all in the same result category - black wins. QED.
Exactly. I'm rated 1600+ on another site for tactics and strategy puzzles.
These puzzles in general follow no rhyme or reason. And I don't think tactics puzzles without themes are meant to train you anyway. (This from Bruce Pandolfini; my former neighbor in NYC.)
As you said, tactics puzzle books and tactics apps (Chess King) are much better for training.
You are spot on with this llama44, but how would you fix it? You could allow users to flag things like "needs more moves", "needs fewer moves" or "needs alternative move" . The problem is that then chess.com would have to spend time acting on this info and modifying the problems - and as you pointed out, they're running a business and their time costs money. Perhaps a group of volunteer chess.com members could do this work.
That's an interesting idea.
Or even as an independent project (for a small group with the technical know how).
Imagine marketing an very large, all online, collection of puzzles that actually helps you be better at tactics