Theoretical physics has locked itself into a corner of not making sense.

Einstein made a huge mistake by promoting the idea that time changes for everything differently, depending on time and space.
This means that even within one thing the time can be different between the front and back of the same thing, causing so many paradoxes.

Einstein also got rid of the basic concepts of global time and global space, which are essential part of the physical world that we see and experience.

What a smart person should have done...
,,is change the idea of relative time with a simple local clock.
The clock-speed defines the speed at which physical forces are experienced.
So if you go fast, the clock goes slower. And the physical forces are experienced slower, making them weaker.
And the clocks do not need to be in sync, because they are not real time.

No mythical time-travel stuff, with exact the same formulas.
Just plain simple.

But why did they promote this time concept, confusing the hell out of everyone?
-> Because they never understood it themselves.