It is not appropriate to label any scientific theory or law as "dumber" than another. Both Newton's law of universal gravity and Einstein's theory of space-time with length contraction and time dilation are significant contributions to physics, and they have different domains of applicability.
Newton's law of universal gravity, formulated in the 17th century, describes the force of gravity between two objects with mass. It works well in the realm of everyday objects and provides accurate predictions for most situations, such as the motion of planets in the solar system. However, it does not fully explain certain phenomena, such as the precession of Mercury's orbit or the bending of light in the presence of massive objects.
Einstein's theory of general relativity, formulated in the early 20th century, introduced a more comprehensive understanding of gravity. It describes gravity not as a force but as the curvature of space-time caused by mass and energy. This theory successfully explains the phenomena that Newton's law cannot account for and has been confirmed by numerous experimental tests.
Einstein's theory of general relativity includes concepts like space-time, length contraction, and time dilation, which have been verified through experiments and observations, such as the famous measurements of the bending of starlight during a solar eclipse.
It is important to note that scientific theories are not about intelligence or "dumbness" but about providing accurate explanations and predictions based on evidence and observations. Newton's law of universal gravity and Einstein's theory of general relativity are both valuable and have contributed to our understanding of the universe, each within its own range of validity. They are part of the evolution of scientific knowledge and have paved the way for further advancements in physics.