Since the flamethrower is confirmed to be found inside the box (and reportedly it’s a small, weaker model with less fuel than usual) we can assume it will be part of the “assault” loadout option.
Still, primary weapons are quite important for a para squad. They make a big difference.
As a matter of fact, the only loadout in the crate with the potential to dramatically change the firepower of a para squad, is the assault one. The others (AT, sniper, mortar) provide support capabilities, but they bring little to no improvement in a direct firefight (such as, storming a cap point).
Most people use to consider only Normandy paratroopers, whose default weapons are all very strong, so paras end up having a reputation of being OP no matter what.
But look at Pacific paratroopers:
Japanese paras assault option is a mediocre MG, yet their default BA rifle shines in Pacific maps, eventually being the best choice in most situations. So, they are at their best straight out of the plane, and luckily their best is good enough, yet far from OP.
Their US counterparts can boast BARs as their assault option, BUT they are otherwise stuck with M1A1 carabines, that… well, they just suck. Lacking punch, ROF and with limited ammo, they feel insufficient at any range. If they by any reason miss their crate, they remain a handicapped riflemen squad at best.
So, going back to the topic,
While flamethrower paras indeed sound scary on paper… will they actually be, though?
It’s not like they will fall from the sky in a rain of fire like a sort of divine wrath.
Those (low fuel, short range?) flamethrowers will only wreak havoc if their users manage to get close to or inside caps, just like ordinary low-tier flametroopers.
Otherwise, Folgore paras will be fighting with accurate yet slow firing, moderate damage SMGs and limited ammo, while being little match for Allied riflemen at range (think of how much open Tunisia maps are), and facing Lanchesters and all kinds of Thompsons in close quarters.
Therefore, I think asking for larger magazines is a reasonable request to improve the future QoL of Folgore paras without really boosting their strength that much.