Do you approve or disown in-game glitches that may improve your status?

Like:

FFVI-Vanish/Doom, Echo-Screen/Joker Doom, etc. (Not glitches, but make the game a whole lot easier.)

FFVI-Relm's Sketch glitch (Only in some NA versions.)

FFII-Attack/Cancel Bug

FFT-JP Scroll Glitch (Hee hee )

FFVII-W-Item item duplication

FFIV-Left/Right arm equipment duplication glitch

FFV-Complicated Ninja/Thief item duplication glitch I haven't tried yet...

That's all I've thought of for now. I personally use all the duplication bugs, and I stumbled upon the sketch glitch when I was a kid. Attack/Cancel is pretty neccessary if you ever want to level up magic...And the JP Scroll glitch is overkill