My take on 737MAX tragedies was lack of FAA diligence. Relocating engine mounts to squeeze in the oversized engines should have required the type certification

My take on 737MAX tragedies was lack of FAA diligence. Relocating engine mounts to squeeze in the oversized engines should have required the type certification process. Instead the FAA looked away and approved a software layer to make it seem similar to existing 737s so pilots could avoid re-training for what would be a new type certification. That was regulatory failure while a bus battery fire could be a one-off manufacturing defect.