I’m going to regret posting in here, but here goes.

No one is saying Callibration fixes the problems you are seeing with content. What everyone is saying is that without Callibration we cannot advise or comment on your changes. Callibration ensures that everyone is talking about the same thing, with a known point of reference.

https://www.exploratorium.edu/cooking/convert/measurements.html

When people talk about a ‘cup of sugar’ or ‘pint of water’ that is a known measurement that everyone can understand and measure by.

Likewise, when everyone is talking colour, callibrated monitors gives everyone a known baseline to work to. If you have a callibrated monitor, and I have a callibrated monitor, and I tell you that your image is ‘too red’ we know that we are both looking at the image the same way. If my monitor was not callibrated and over-pushed the reds, me telling you your image is ‘too red’ and you reducing the reds, means when someone else looks at the image, they will say ‘not enough red’.

If I am colour blind, would you trust my opinion on colour? No, because I see things different to you.

If you do not callibrate your monitor to a known standard, no one can help you because we don’t see the same colours as your monitor. We are looking at your changes on our monitors and our monitors display colours differently to yours.

I do not speak French, so I cannot critique your French writing. Without Callibrating your monitor we are speaking a different language.

If you don’t callibrate, no one can help you as no one sees what you see, and if no one can help you, there’s no point posting for help or comments.

Does any of that make sense to you?