As a material engineer, I do agree with what you are saying, but it's nothing impossible for other countries as you are seeing it. Other countries who have this technology achieved it decades ago and with advancements in materials, processes and technologies, it's not as hard as it was years ago. To give you an idea, last year, Mapna group (which is the biggest Turbine manufacturer (one of its subgroups to be specific) in Iran and ME if I'm not mistaken) managed to produce single crystals which can be used in turbine blades, jet engines. As the company's manager says, they have overcame most of the difficulties and challenges in making a proper Turbofan engine and they are moving towards it. It has many difficulties, indeed, but nothing that can't be solved. I'm sure in just few years, we will see that engine in lights of the day, and also, we have very capable material engineers as I'm in close contact with people involved in the industry. We do have some budget problems though, and hopefully, it gets solved soon.
Turkey can also produce a Turbofan engine if it wants, and it has the advantage of having close contacts with some international companies which can give some assistance, we don't have that luxury now and hence, might do most of the work by ourselves.