The gun on the A-10 is phenomenal, as are the guns on the AC-130s. That being said...what percentage of today's kinetic strikes are direct-fire weapons vs PGMs? I don't have hard numbers (sts), but I know what I've seen on numerous deployments. In a true CAS situation, there is a ton of value in direct fire...when it's HVT whack-a-mole in a permissive environment, it's not really needed or even desired in a lot of situations.
Advances in PGMs plus the nature of the fight over the majority of the last 15 years has led to the overwhelming use of PGMs. 6K of hard points is plenty of bang per sortie, especially if using lighter weapons like Hellfire, Griffin, SDB, or even newer systems like SGM or APKWS
To me, the potential advantages of the Scorpion, if it's executed properly, are fairly significant. Better FMV sensors than current fighters for ISR and PGM delivery. Long legs for a fighter without needing AR, especially if you use external tanks. Plenty of internal payload for other intel packages that are key in the process of finding HVTs. Enough speed to sprint toward a fight, but stability to fly at very low airspeeds for the endless "Wheel in the Sky" ops.
Looking at it for the ONE mission is something I've heard tossed around since it can perform basic intercepts and patrols over CONUS at a much lower cost the the Viper. Obviously the low-intensity fight is what it was designed for, for all the reasons above. Competing in a future T-X, especially with a modified swept wing, is also something I've heard as a possibility. And those are just options for the US. Foreign sales are a primary consideration and some of our allies need the type of capability this jet offers at this price point even worse than we do.