Alternative Assault Resolution qualms

[beldurax]

Recently, while playing the Utah scenario (Night Drop) from Normandy 44, I encountered a bit of weirdness, for lack of a better term.  One of the default rules for the scenario that was checked, that I eventually figured out was the bugaboo for the weirdness, was Alternative Assault Resolution.  The behaviour that was occurring was this: all of my U.S. paras would attempt assaults, some at overwhelming odds in their favour, but still the result of the assault was practically nothing.  I scratched my head in puzzlement, until I came across the Gold Design Notes for France 40 where Alternative Assault Resolution was explained.  It then made sense.  I then restarted the scenario with this option off, and assault then were resolved as they should be according to who was attacking who (i.e.  100 paras assaulting 12 German garrison troops succeeded in their assault).

So, my underlying question is, why were the Alternate rules enabled in the first place ?

Thanks, Travis