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I will copy paste to save me some time:
The OKW doesn't have any scout units or other capabilities to scout (no sniper/222/T-70/M-20 and the stuka smoke strafe isn't a proper reco). The IR-HT got nerfed which was needed but is still a big impact on a core unit of the OKW, if you see more flares it is because that's the only remaining option for the OKW and the whole axis side.
Those flares are critical for the OKW and that's why they are criticizes. To counter the arty dominance of the Allies, flares are needed. To use properly the panzerwerfer, you need those flares. Both axis rocket arty are "precise strike" and not "wiping area machine".
Plus most of the "meta" Ostheer commander doesn't have reco plane, nerfing flares will just make the need of Elephant+Scope even more present.
So instead of crying out an OP ability which lasted for a decade (exactly like the T-70 is to the SU) and which is part of every teamgames tactics, try to give them first other viable options and see if it remain a must-have ability.
Now why did I took the example of the T-70?
The T-70 is arguably the best light vehicule and the latest, it is versatile and so gives a lot of flexibility, hence some argued in the past that it is "OP". But the power of the T-70 what due to the role it has to fulfill within the tech of the SU and without it the whole 1vs1 SU would have become useless.
The idea is exactly the same with flares for all the reasons stated before, it is arguably strong like the T-70 but also fulfill a major role for the OKW and the whole axis side in teamgames. And due to its role, it seems OP.