I am totally with you. I have had a 144Hz monitor for 2 years now. I am 100% sure that everything was configured correctly and I could spot some small differences in the UFO test. But other than that I do not feel any differences in day-to-day activities or games. Windows reset my frequency settings occasionally, but I never noticed it.
As a SW Engineer from Germany, you will be surprised how much code exists in other languages. But I would expect companies on the edge of technology, who are either working closely with universities or with open source, that they usually chose English.