There is a rule in technology. Engineering is the Art of Compromise.
This rule applies to the sound as well as to the picture. It applies to the equipment that creates sound and picture. It applies to safety equipment and the carpet that we walk on.
It means that there is always a trade to make between speed or size or cost or portability, or the push to be the greatest or even the cheapest.
Maybe you want more light on the screen, but that will give you more scattered light too, and that is not a good thing. Or you think, OK, I won’t let it scatter, I’ll direct the light using curved screens and screens of different materials. But directing light will bring you ‘hot spots’ and that can be worse.
We are surrounded by the decisions of designers who have to balance these things everywhere in our daily lives.
There are machines, tools really, that will test light and sound. They are usually very expensive, and they require very trained people to set them up and use them properly. These people must then take the tests properly and then read the results properly. So, it isn’t only that the equipment costs 15,000 to 30,000 dollars or euros. They also consume expensive technician time.
So, that is the trade-off, the compromise. We can the projector and screen perfectly calibrated every week, or month, or 3 months or 6 or 12. We just have to pay for it and the people to run the equipment.