On G2, if you can take Kar and US is going somewhat/mostly pacific then yes, I can see a french IC. Other than that though I just don’t see it. In my typical KGF games germany will only make over 50 IPCs for one turn, at most. After that she struggles for the 40s.
On allied turn 2 is when the UK starts dropping heavy into Karelia, Norway and Finland are lost, and the US will drop in Africa (sometimes on turn 3), and atleast 2 bombers are SBRing you, sometimes 3. By allied turn 3 Italy is threatened with US landing, france is threatened, Karelia should be secured (almost secured), and if only 2 bombers SBR you that means Italy’s fleet is at the bottom of the med.
I’ll take a bomber, or a fighter and 2 armor, over an IC that will likely end up being a liability.
Now yes, the extra IC lets you avoid repairing SBR damage. So for 15 IPCs you get 6 more units to build, or you could have repaired for 6 IPCs, so in that sense it is pointless. And on turns 2-4 you want to produce units with G that have some punch to keep Russia honest and to threaten allied fleets, inf cannot do that. Let Italy build the inf to help you defend and tell Japan to hurry it up.