You can't evaluate who will win a battle unless you know which words are in their dictionary, which you can't know without tediously (at least right now) lookin

You can't evaluate who will win a battle unless you know which words are in their dictionary, which you can't know without tediously (at least right now) looking up every word you might play, plus every word the opponent plays in their dictionary. This tedium bogs down play. Better to have the board indicate which words are valid or not, and warn before I play an invalid word.