On light infantry, I think some changes that could be made to them, in order to further refine their role and usefulness could be to make them even cheaper to airlift and strat move than currently. On top of the aforementioned, the malus taken when moved in either of the two suggested ways could be reduced to guarantee that the unit's readiness does not go below 75%. I think these simple changes would open up a whole new realm of both tactical and strategic options for players, and maybe even the AI as well whether on the offense or the defense (seizing critical nodes and infra with paratroopers anyone?).
The topic of differentiating Mech artillery and towed artillery seems to be one that pops up frequently. In order to resolve this I think Mechanized artillery should get a bonus to both attack and defense when fighting other artillery, mostly to represent their ability to more effectively engage in counter-fires than traditional towed artillery.
To further differentiate them, and make choosing between calibers more meaningful it could be made so higher and lower calibers have an inverse relationship. This could also be introduced in the case of direct-fire systems, although not to the extent that high velocity rounds would be rendered obsolete by high caliber howitzers and vice-versa:
- This means higher calibers would trend towards higher hard target damage and maybe even the ability to reduce unit entrenchment bonuses (a neat way to introduce siege guns to deal with bunkerized positions IMO), and a movement malus at higher calibers.
- Meanwhile, lower calibers have higher soft damage until a certain point where they instead lose damage, but gain extra attacks against soft targets and a movement bonus. Maybe even the ability to equalize its movement to dismounted infantry instead of a flat movement bonus.
- The latter would have the bonus of serving as a simpler, and abstracted way to introduce mortars without having to add a new model. Maybe even consider having the unit art change to that of a mortar when using lower calibers if feasible too. This would introduce a neat way of simulating the use of mountain guns and/or mortars for dedicated light infantry.