"not being able to travel faster than light speed, ............? "
Probably, I think that anyone hoping for a time machine is going to be in for a shocker, well a shocking disappointment. As I'm sure you know, photons that leave us are essentially carrying our past away from us, at the speed of light! Our past is always leaving us behind at the speed of light. I think it's a beautiful reminder by God to respect the present, as well as a reminder of the limits of our capacities.