Two sides of the airweight experience
Side 1 story: My personal EDC has been my Model 637-2 since late 2010..up until Covid, approx 50 rds per month mostly 38 Special, Win White Box. Carry rounds have been +P but only 5 rds. per month during practice.
Absolutely NO problems encountered, no abnormal finish wear, and zero mechanical or erosion issues.
Side 2 story: Saw an add a couple years ago for a Model 12-2 at a reasonable price, so went and looked. Horror of all horrors! Extremely heavy wear to almost all surfaces. Have no idea of round count through this gun, but suffice it to say I didn't walk away from this one...I ran!
I don't think yours should have an issue that even S&W won't "service" especially that new (5 or 6 years) and apparently, they are telling you that the gun is what: Unsafe?, Shouldn't be fired?, Use different ammo? or what? The Factory should have been more clear on what you are supposed to do now...moving forward?
Like you...I'm wondering if you should call again for a second opinion from maybe a different tech at the factory and literally ask what can I do now?