Subsequent generations find the concepts...
Subsequent generations find the concepts, religions, and systems devised by earlier generations defective, erroneous, and irrelevant. Hence the need for continued updating and change. In contrast to this, the Islamic concept originating in Allah, is different in its origin and in its characteristics from all these humanly devised perspectives.
By its very nature it does not require any updating or change, for the One Who made it sees without any limitations of time and space, knows without any defect of ignorance or error, and decides without any influence of prejudice or selfish desire.
He made this concept for the totality of mankind for all times and conditions as a holistic paradigm or permanent system of principles within the bounds of which mankind develops, evolves, grows, and advances without ever reaching the boundaries of its framework. Motion, it appears, is a law of the universe and it also is a law in the life of man who is a part of the universe. But this law of motion is not free of restrictions or without some control, if only because it is a coherent system.
An analogy to the life of a man is a planet with an orbit and an axis. This Divinely-revealed Islamic concept is like the sun around which the life of all mankind is to revolve. There is plenty of room for mankind to grow, progress, advance, and evolve, while still remaining in the field of attraction of this central concept. Moreover, this concept is perfect and complete. It does not require any "spare parts" from outside or any change for completion.
Since it is given by Allah, nothing from a source other than Him can fit it. Man is incapable of adding anything to it or making any corrections in it. Indeed, it has come as a gift to man in order to make him grow, correct him, and propel him forward. It has come to enrich his heart, his intellect, his life, and his world.
This concept is designed to awaken all his powers and potentialities and to employ them entirely for constructive purposes under its own direction and control, so that they are not dissipated in futile pursuits. For the fulfillment of these objectives this Divinely-revealed concept does not need to borrow from outside nor does it need the infusion of foreign blood nor any methodology other than its own.