A while ago I run into a following problem with resolving damage to locations of airspace units with no armor left - according to p. 238 all damage to structural integrity of an airspace unit is halved an rounded down, making 1-point damage groupings (such as LB-X cluster pellets fired by non-airspace units or light machine guns fired by airspace units) harmless to airspace unit locations which no longer have any armor left. Such hits not only don't cause damage to SI, but as a consequence also don't cause crits (barring a natural 12 on a to-hit roll, which according to "Lucky Hit" paragraph on p. 239 may cause a critical roll), or even control rolls (see pp. 92-93), which would be required if an aerospace unit suffered a hit that actually damaged it in atmosphere (including a 1-point damage grouping which struck a location that was still protected by armor and as a consequence was not halved and rounded down to zero per SI Damage rules on p. 238).
In other words it looks like it is actually worse for an airspace unit to have armor than not when taking 1-point damage hits.
Do I interpret the rules-as-written correctly? If so, is this situation intended? I doesn't feel like that to me, especially since LB-X autocannons firing cluster munitions are supposed to be some of the best short range anti-aircraft weapons in the setting, and the rules as written seem to make them almost completely impotent against unarmored airspace units. Not to mention that the same rules make putting light machine guns on fighters a... questionable choice. Though that may be less of a problem, considering that as far as I'm aware LMGs aren't exactly common on canon aerospace units.