If they widened the timing window for swing and miss AND for weak contact, it would drastically improve hitting. The number of ABs where an opponent with no clue what he's doing can foul off 5 or 6 pitches with terrible swings is a joke.
If they widened the timing window for swing-and-misses so that more "very early" and "very late" swings were whiffs instead of weak fouls balls AND widened the window for weak contact so more "early" and "late" swings, ESPECIALLY on balls out of the zone, were actually put in play, I think you'd see a big improvement in hitting quality.
Right now it's an absolute joke how someone can put 4 or 5 terrible swings on balls and not be punished and then FINALLY put a decent swing on a ball and hit it out. You shouldn't be rewarded for only being able to have good input on 1/5 swings in an AB.