Yeah, I don't think there is a "right" answer for fallback track order handling...the season + episode tags are the only way to unambiguously tell apps what the intended track order should be.
If SF is missing some season + episode tags in a music feed, maybe an "update track order" button could help normalize / fill the in the missing track numbers? Not to put work on your plate Steven Bell :pci: :pc2red: (npub18a6…pny4) 😬 something for down the road possibly.