I think the problem with that setup is that the player who chooses to attack the other would be at a disadvantage since their own way to safety will be longer and might be blocked by enemy units. If the only way to avoid a draw is to make victory for your opponent more likely than for yourself, most strategically-minded people will probably prefer the draw.
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Every unit would need to be weighed on whether it would be better denying the enemy victory points by killing, or retreating as quickly as possible. If a powerful unit can kill 2 weak units, then it's already both made back the VPs it might lose by not escaping and denied the enemy 4 potential VPs, and with a turn 1 charge available, that powerful unit is not going to struggle to kill something. I don't think either full retreat or full attack would be viable strategies compared to using stronger, slower units to take out and screen enemies while weaker, faster units retreat.