You have to remember the GWOT was fought against ill equipped combatants, unarmored vehicles, and cinderblock structures. The US is generally not worried about those types of threats in planning for future conflicts. There is a reason why Ukraine is getting F16s and not A10s: The Russians brought more than just AKs and Toyota Hiluxes across the border. The A10 is a good aircraft but times have changed and we have much better platforms now.