It has been observed that a writer says, basically, one thing, and says it over and over, no matter how wide his spectrum or in how many different ways he may say it. I am, regretfully, unfamiliar with Savchenko's other works, but his thrust is clear here. Let me give you some of it by quoting:

“Man is the most complex and most highly organized system known. I want to figure it out completely — how things are constructed in the human organism, what influences it….

“You see… it wasn't always like this. Once man was up against heat and frost; exertion from a hunt or from running away from danger; hunger, or rough, unsanitary food like raw meat; heavy mechanical overloads in work; fights which tested the durability of the skull with an oak staff — in a word, once upon a time the physical environment made the same demands on man that — well, that today's military customers make on rockets…. That environment over the millennia formed homo sapiens — the reasoning vertebrate mammal. But in the last two hundred years, if you start from the invention of the steam engine, everything changed. We created an artificial environment out of electric motors, explosives, pharmaceuticals, conveyors, communal service systems, computers, immunization, transport, increased radiation in the atmosphere, paved roads, carbon monoxide, narrow specialization in work — you know: contemporary life. As an engineer, I with others am furthering this artificial environment that determines ninety percent of the life of homo sapiens and soon will determine it one hundred percent. Nature will exist only for Sunday outings. But as a human being, I am somewhat uneasy….

“This artificial environment frees man of many of the qualities and functions he developed in ancient evolution. Strength, agility, and endurance are now cultivated only in sports, while logical thought, the pride of the Greeks, has been taken over by machines. But man is not developing any new qualities — the environment is changing too fast and biological organisms can't keep up.