It may be obvious to many of you, but I saw teams of amateur developers dreaming the perfect operating system, starting from the idea that the contemporary operating systems (like Unix or Windows) are still far from being perfect. In particular, I remember an italian news group that was frequented by more than one developer that wanted to create his brand new operating system starting from scratch, programming it just by himself, so they gave me the inspiration to write this article, maybe it could be useful to avoid that the same disaster will ever happen again to someone else. Even if you are the superman of computer programming, today you cannot pursue the impossible dream of creating your own operating system without hurting yourself for precise technical reasons. I don't want to discuss here about the difficulties related to the creation of a new file system, virtual memory, inter-process communication, multithreading and so on, because my example is easier and more solid than that. I want to assume that you already have programmed a working kernel for that kind of operating system, a "minimum" set of drivers to make it run on your pc and that you are ready to share it with the entire world. Well, even in these ideal conditions, the main problem is with the companies that currently are using Windows or Linux and that should invest money to drop their operating systems / applications to use your operating system, the same for the hardware vendors that should write the specific drivers, the software houses, curstomers, professionals, video gamers and so on. Today there are so many hardware devices that is almost impossible to achieve the same performance that already existing and most proven operating systems have achievied in so many years of existence. It's not a matter of programming skills, it's a matter of "temporal gap". Even if you are so good to achieve the perfection on a single machine, you cannot be able to obtain the same stability on the wide range of existing personal computers, tablets, smart phones, sbc and all the devices mounting all the existing peripherals, because you won't have the money, credibility, reputation, experience, employees, followers, curtomers to do it. The situation in the past was sligtly different, Windows was created to run mainly on x86 family of processors, but there were other operating systems (like Amiga OS) that were projected to run on 680x0 family of processors, so the idea of operating system was more embedded to the small set of hardware that the vendors had to sell. Today it's totally different. If you want to create a valid operating system, you have to cover all the existing hardware produced at least in the past 20 years, or even if your main target is a single device, you cannot surpass the existing operating systems because they are already optimized to work better on the same device in terms of performance and power consumption. In conclusion, if you are having the crazy idea of creating your own operating system, just forget it because you are wasting your time and the opportunity to produce something really useful. You will never produce even an ounce of what is required today to run a modern application on modern hardware, with the same degree of portability and support in terms of graphics / audio / peripherals, and even if you do it, there are already more stable operating systems that are doing the same thing exactly when you are having the bad idea of doing it.