I have used those calibration sensors before, but only when I have had to put up a video walls to make all the screen match up as say 9 screens (3x3) make a whole image and it is important that every screen match. If you say have dual projection it is again important you have matching images (especially if you are blending which I don’t really get involved in but I might put the projectors in) I understand you are trying to tell me that calibrating my monitor may change things slightly about my screen but that it is not that important unless you have the same screen as me as different screens will display an image differently. Even if I Calibrate my display it will still look different on yours to mine unless you have a very similar panel.
There is a bit of a futility to such things as my monitor is not part of your image nor is your monitor part of my image.
Seriously? If you don’t make sure the rbg balance on your monitor is accurate, how do you know your monitor isn’t lying to you? Calibration is important. No, it might not get us 100% in agreement, but it gets us 98%. And you shouldn’t just be using one monitor or screen. I use 6; 2 computer monitors (both ACER), 2 TV’s (1 Samsung and 1 Sony), 1 tablet (a Kindle Fire), and my HTC Phone (which has a known red slant). I know the Samsung is a bit dark, the Sony a tiny bit yellow, the tablet too bright, etc. You have to know these things and check the color on multiple sources so you know how it is coming out. What we are telling you is that on our monitors your work isn’t looking too good. It is far too yellow and dark, likely meaning your monitor is too red and bright. This will skew what you think looks right. So that is why you calibrate your monitor. Even if you can’t fix it perfectly, if you know what sort of bias your monitor has, you can correct for it. If you don’t calibrate your monitor you can’t correct for it and your results will be … less that perfect.
But don’t stop there. Play other movies on your computer. Check out what professionally graded movies look like. Particularly some of the well done classics. I can vouch for Blade Runner and American Graffiti. Because if you are slanting your corrections a given way, you will notice that they don’t match well done home videos. If you find that everything is too red on your monitor, it is probably your monitor, not the material you are watching.