I had to chime in here since I want to prevent fallacies.
Nothing is wrong with the process. An IR extremely accurately simulates a mic'ed cabinet. De-phase is definitely not necessary. I don't use it.
It's all about the use case you're in. Like I said in the official de-phase thread I'm sure FRFR guys will find it a useful tool.
Are you more impressed with guitar sounds that you've heard on albums or are you more into guitar sounds you've heard in the room? If you're more impressed with the tones you've heard in a room then you can use de-phase to kind of simulate the feel of being in the room with a cabinet.
For line-in recorded tones for your band's music f.ex. you will not get "a more authentic" guitar tone by using de-phase. Phase is not a bad thing. It's a strength when used correctly. This doesn't mean that de-phase sounds bad. It doesn't mean it sounds good. It means that it changes things and I suggest you to use your ears to determine if you like it or not. I'm sure it can rescue some IRs and make them sound better.
what is going 'wrong' with the process that De-Phase becomes necessary?
Nothing is wrong with the process. An IR extremely accurately simulates a mic'ed cabinet. De-phase is definitely not necessary. I don't use it.
It's all about the use case you're in. Like I said in the official de-phase thread I'm sure FRFR guys will find it a useful tool.
Are you more impressed with guitar sounds that you've heard on albums or are you more into guitar sounds you've heard in the room? If you're more impressed with the tones you've heard in a room then you can use de-phase to kind of simulate the feel of being in the room with a cabinet.
For line-in recorded tones for your band's music f.ex. you will not get "a more authentic" guitar tone by using de-phase. Phase is not a bad thing. It's a strength when used correctly. This doesn't mean that de-phase sounds bad. It doesn't mean it sounds good. It means that it changes things and I suggest you to use your ears to determine if you like it or not. I'm sure it can rescue some IRs and make them sound better.