The A-10C has always been very potent in simulator battles since its launch. It still dominates red side fighters with little effort. It gets 4 IRCCM missiles which are the best for simulator battles, Very good sustained turn performance with very low stall speed, vast arsenal of A-G ordnance, MAWS with a lot of countermeasures. It is a very good all-rounder in simulator battles now.
Its potency has only increased with the introduction of GBU-39 glide bombs. It can effectively clear 1.5 front-line battles by itself or it can clear airfield AA of two airfields without any risk of getting close. No other plane has this capability until top tier.
Its earning potential is just too high with little risk to justify such a low battle rating.
One might argue that this plane is slow and it justifies the low BR, that isn’t a weakness IMO. Being slow makes it very easy to fly low without crashing and makes you invulnerable to any radar missile.
It should be adjusted to 12.0 / 12.3 in simulator battles.