It's more like: Why SBC-MAS Mail got just 4 AC Coach!!!
Karnataka never been a high AC count train (before H1, it was just 5 AC Coach Train). H1 too was put in quite recently which may not be required in Pandemic hit Era!!
Instead of AC it seems HCPV got more demand for this sector!! Even SBC Mail don't get any additional AC Coach while TN which was tagged as failure with slow run by bloggers got phenomenal AC Coach addition (coz demand exist in that sector)!!