As I see it, the chess.com "analysis board" is a rather weak feature that could use a lot of improvement.

What do people think about the option to open an "examine" session? This could be with the starting position, or a specified PGN or FEN loaded. The session could be public or private. In the former case, other players can observe, and the board creator can grant observers "examiner" status, which lets them move pieces around as well. All moves made are saved and displayed neatly in variations and sub-variations in a window beside the board, and these can be edited and commented by the examiner(s). You can save the session locally on your computer, or on the chess.com server (maybe even stick it to a specific game for future reference, if you were analysing one of your correspondence games).

This would be very useful for better analysis of correspondence games, post-game analysis with your opponent, and maybe most of all in a private lesson with a chess coach. This would probably make chess.com a much better platform for online chess coaching.

Several sites that I can think of have similar features, and I think it shouldn't be too hard to implement into the chess.com live chess platform.