But once those SRBs were lit, it was going up, or blowing up... While it's not a capability unique to Falcon, it's still neat that they're able to be sure ever

But once those SRBs were lit, it was going up, or blowing up... While it's not a capability unique to Falcon, it's still neat that they're able to be sure every engine providing thrust is operating normally before they let it go.