One point that I forgot to mention in my long post about how business actually works - it's an obvious one but some people on here seem to miss the obvious...
The manufacturers aren't photographers, and whatever they may say to the contrary they don't respect photographers. They're businessmen, and one of the most successful used to be a banker, so they know little about the real world use of their products and care even less.
Sometimes, they come up with a lemon. Usually, these products sell very well because they are highly speced and have all the gadgets, but they may have design faults that simply can't be fixed (they often overheat for example) and when that happens, and when we find that it's just a bad product that will never be right, we discontinue it. We lose a bit of money because of the cost of after sales service, but losing a bit of money is better than continuing to run a product that won't have a long life.
Obviously, the factories learn about the problems, but it isn't in their interest to discontinue them, and they sometimes run them for years. I'm not going to name names, but there was a portable flash system a few years ago that was too highly stressed, and every single one of the first batch failed within about 4 weeks of use, but the factory carried on making it until, eventually, they brought out a new model to replace it