Don't Brets have to surrender the first turn to get their ward save, or something along those lines?
Both of you forgot a huge one for the Undead: severe marching limitations. Fear, too.
Let's just agree that it's not at all uncommon for a helpful special rule to include a drawback or offsetting harmful rule.
But that sprinters rule seems ludicrous to me. Dwarfs seem like the last race who would ever launch a mad, ally-trampling scramble to get into combat.