My point was that no action is taken until the position of the bolt is verified, the old cant,look, and #### drill. Even when conducting drills in a tactical environment you check the position of the bolt first, if it is fully/partially forward you pull the action to the rear using the CH, if it is fully to the rear dump the empty mag (99.99% of the time) insert fresh mag and hit the bolt release or use CH.
Wouldnt diagnosing the stoppage take additional time, and be difficult particularly under stress or low light conditions?
What I use is an immediate action drill of:
Push pull (the magazine), rack, roll (the carbine to the right, ejection port down), go. This will clear type 1 (failure to fire) and type 2 (failure to eject) malfunctions, no thinking or assessing the bolt position required.
If this doesnt work (ie a type 3 malfunction, double feed or failure to extract) I then carry out remedial action:
find cover/take a knee, lock the bolt to the rear, remove the magazine, finger f*ck the action to remove any empty casings or live rounds, cycle the action 3x (to remove a stuck case from the chamber), insert a fresh magazine, push pull, rack the action and go.
I find this works much better then the: lock the action the the rear, remove the magazine, and shake the weapon while praying the casing stuck in the chamber will magically fall out
These two drills will clear all stoppages with no assessment or thinking required and work on everything from the AR to the Ruger 1022, CZ58, M1 Carbine, Sig 550, norc M14 etc etc.
I do admit hitting the bolt catch is faster when doing a speed reload but my small caveman brain finds it easier to rack the CH as I prefer to rack the slide on my Glock, it keeps things simple.