I think you put some people back on their heels by saying they are afraid to use the device because they don't want to know the truth. Having said that, what it comes down to for me is this: Is a straight stroke important or not? I look at what the cue is doing (not what movements they player is making, just the cue) when the best players stroke the cue and I have to conclude that a straight stroke is important and worth trying to achieve. This is confirmed in my own play and, I have to say, it is kind of common sense.
If a player has grooved a funky stroke that happens to be perfect at the time it hits the cue ball AND it is perfect no matter how hard you hit the ball, then maybe you don't need to "fix" your stroke. I think few fall into that category.
There is something that I think is being missed here as well. People talk about whether the ball goes in the pocket and you get the cue ball where you want it, so what else could you want? My reply is, "Are you sure the cue ball is going where you want it to go"? If you set up certain mirror image type shots you may well find that the cue ball goes in different directions by two or three ball widths over a short distance depending on whether you are cutting the ball left or right. This can be a perception problem and it can also be a stroke problem. The point is your position play may be suffering more than you realize due to a small stroke defect.
I've been holding off on the Digicue because I had a bad experience with another brand, and I've managed pretty well with other technologies, but it sounds like the Digicue Blue works pretty well. Maybe I'll go ahead and just pick one up.
I think it is a hard argument to make if you are trying to say that technology isn't a good thing overall.