Just a thought I had about the relevance to forms and fighting.... I mean doing only forms.
Lets use guitar for an example. Say you spend 8 hours a day playing air guitar, playing your heart out on your good ol air guitar. I bet you are great at the strumming motion and moving your hand up and down the imaginary fretboard. Now someone hands you a real guitar and asks you to play it. Well, you certainly can move your hands up and down the fretboard, and look like your playing, and even strum well if you knew the frets to press... but you dont actually know how to play guitar.
If you consistantly work on forms and never fight, your training is similarly relevant. You may be in great shape, you may be quick, but in a situation where you really have to fight, what happens?