Why are the so-called racial characteristics insignificant for life in modern conditions?

Different races, they are also human subspecies, were formed in the process of evolution as a means of adaptation to different, and sometimes extremely specific environmental conditions. So, all signs are adapted to the external conditions, from metabolic rate to curly hair. However, in modern conditions, the benefits of civilization are available for most of the planet’s inhabitants, which allow artificially regulating external conditions, using the necessary changes for a comfortable existence.