You get the evidence cards that are unrelated to your case into your display. Hover over them to quickly highlight them on the board.

The spacial clues of what's related and what not and figuring out the solution *is* the whole game. BGA guidelines tell that implementations should not "help the player" in a way that the original game could not do.

About: "waiting for a card" or not getting one that has already been taken: that's also part of the game, sometimes that's luck, but it can also be part of the strategy to take away a certain card from a player; or taking the last card of an aspect, so that the next player is forced to use an investigator etc.

Also, in turn-based games you can takes notes in the UI. In realtime you can take notes manually.

So, I can see how this feature would be convenient, and I'm also not 100% against usability features (that may not be possible in the real game; i.e. the card highlighting is one I implemented because it makes handling easier); but in this case I think it would be too much help where the thing you complain about *is* essentially the game.