Even if TIME is recorded, what good does it do?

Since it is so fascinating to talk about theory when we are in the well, think about what would you do after that when you jump out the well looking at the whole picture.
Jump here and there to rectify or alter the past for an ideal future, if doesn't turn out to be the way you prefer, go back and do it differently, I think it is stupid, I choose not to be born instead.

This whole idea is just for the sake of argument for those who think linear.

I don't think you quite grasp the concept of what time is as discussed in this topic. Firstly time is no more a creation of man than is physical space. Both are innate quantities in the universe, and are universal in accordance to physical laws.

Secondly no medium holds time, time IS the medium. And the measurements that we make, i.e. with clocks, measure the changes in this medium. Similarly no medium holds physical space, space is the medium in which we measure distances. As to what's beyond these, well there's just no concrete answer.

You could argue about the existence of higher layers of abstraction (what's beyond the universe?) but they're strictly in the realms of theoretical physics, such as string theory and the like, and is of a separate scope altogether.

I also disagree with the notion that time dilation is not a form of time travel--because it can be. Make it so that you travel fast enough (say, 99.9% of the speed of light), manipulate your own (perceived) travel time, and you can travel to (nearly) any arbitrary point in the future.