I haven't worked it out, but could an ASF do this mission more cheaply, with less transport needs, and with easier maintenance?
IIRC, ASF don't have the capability of dropping infantry or BA (or light vehicles; had a prototype that could carry 50 tons in addition to the Arrow IV but you need to slow the ship down 1-2 points to get it to work). Small Craft also have a strategic fuel use value, though that usually shouldn't be relevant in this use case.
The infantry carrying capacity theoretically allows it to do other roles in a pinch, such as SAR or general personnel transportation, though it's not the primary purpose.
I'd have thought with the Small Craft used you'd have better range and endurance than an ASF. Also 200 tons brings a lot more to table
Only thing I'd say is wouldn't a spheroid be better? Rule of cool it's a plane but if this thing has to come down in contested territory I'd rather be able to pick my spot landing
Also nothing to protect itself or its ground troops when loading and unloading ouch. Unless you're dropping an escort foe this too I'll leave my inferno platoon ready to shower your platoon and the ship
A Spheroid-based small craft has basically no maneuverability in an atmosphere, so it would essentially be forced to engage from the ground, in which case it would have to land dangerously close to the objective in order to get any usage of its artillery piece, in addition to being vulnerable to any ground-based artillery, both Arrow IV and Tube-based. Aerodynes have some maneuverability in an atmosphere, so the NL-48 is intended to take off after dropping off their BA and loiter behind the lines while the BA call targets. Naturally the trade-off is it's vulnerable to fighters, AA Arrows and the like, so you don't deploy them when you're losing the air war (though that's likely true for a spheroid-based shuttle anyways).
Actually, I'm a bit confused on whether
Small Craft aerodynes can VTOL or not. I mean, the Mark VII landing craft is explicitly called out as VTOL capable Aerodyne Small Craft, but that could be just fluff. The information I've been finding between SO, TW & TM have been rather... inconsistent.
Unfortunately it's just about impossible to add extra guns to the ship while also retaining the other important aspects of Arrow IV & BA company. Adding guns also means adding gunners, and even with steerage-grade quarters rapidly eats into the payload. By the time you add enough defensive armaments to be useful, you've no longer got a Small Craft but a Vampire dropship.
While it's noted that an ambush on an unloading NL-48 would be brutal for obvious reasons (and an escort for small craft in general is a good idea if the ASF assets can be spared), I would also suggest that picking which location on an entire planet to place your infantry platoon for that ambush is a proposition which is easier said than done, even if you happen to know their intended target beforehand.