By the turn of the 20th century physicists noticed that objects seemed to be distorted when they moved. Fitzgerald, Lorentz and others saw that this would be so if all physical reality were comprised of a fundamental thing that must always move at the invariable speed of light. Einstein held a different view. He assumed it was space and time itself that was distorted. Einstein's view was accepted. Academia still holds to Einstein's view but many physicists reject it. Let's examine some of the reasons why they reject Einstein's view.
When we consider space-time as flat we are forced to explain relativity phenomena as Lorentz explained it. Motion somehow causes physical objects to distort themselves. This was explained to Einstein by H. Ziegler He showed that the amount of distortion and the physical shape of the distortion is exactly as it would be if the most elemental constituents of matter must always move at the invariant speed of light. There would also need to be a special inertial frame that is at rest in space.
Einstein's view eliminates the special inertial frame and only considers relative motion. Calculations are therefore more simple. One factor is eliminated. But the great tragedy is that we no longer have a force pushing us to conclude that matter must be made totally of light-speed constituents.
Given the accepted elasticity of space-time, otherwise ridiculous notions might be accepted as well. The Big Bang Theory might be considered the reality, when it can not possibly be. Matter, consisting of light-speed constituents, could never occupy such a large portion of the universe. There was not enough time for the universe to reach its present observed size. Much of the accepted natural laws such as the light-speed limit of moving objects are not compatible with the Big Bang Scenario.
Let us assume for a moment that matter is made of light and see if it answers any questions for us.
When we remove the tragedy that warped space-time gives us, we are forced to view nature in a very limited and restricted way. Given all the restrictions we would expect that some observed reality would not be possible. However, we find none. What we do find is that some questionable notions about nature are in conflict.