Not really, just pointing our the fact USF actually does have some options for indirect fire they don't need to pay 151 fuel for.
Both WFA factions are skimpy on indirect fire tbh.
Not all indirect options provide the same role.
There are attrition based indirect like mortars who's role is to bleed players as they attempt to attack or provide light anti support weapon support for your attacks.
Then there are barrage type weapons who's roles to break up larger defensive formations and punish blobs.
Okw has both types in their no doctrinal lineup. i would like to see them get more through commanders but it is by no means necessary as both will fulfill their roles without need of a doctrine.
Unlike USF who has two attrition types and MUST choose a doctrine if they want a real barrage type indirect weapon.