While one can transform between the time and space axis within relativity, and indeed it is fundamental that one can do so when one relies on the axiom of the constancy of the speed of light in a Euclidian universe that SR uses, that doesn't mean that measurements of time and space are identical things.
Relativity is a theory (a very good theory that makes a lot of experiments make sense, but still a theory). It is a way of looking at things, it is not Truth itself. The universe doesn't care how we look at things, it just is. When I experience the universe I do not experience time and space as the exact same thing, nor do my measurements of time and space look the same. I have to put them into the framework of the theory of SR to make transformations between them look like the same thing.
Time and space are whatever they are. I don't need to use a four dimensional spacetime to describe them. Indeed, when I do I make mistakes (see the complete incompatibility of QM and GR, or the complete failure of GR in galaxy rotation curves, galaxy interactions, universe expansion, etc.).
So to think that they are the same thing is not necessarily appropriate outside of the scope where that axiom makes sense.
As far as I'm aware, no one has any real clue what "time" is.
Meh, not exactly.
While one can transform between the time and space axis within relativity, and indeed it is fundamental that one can do so when one relies on the axiom of the constancy of the speed of light in a Euclidian universe that SR uses, that doesn't mean that measurements of time and space are identical things.
Relativity is a theory (a very good theory that makes a lot of experiments make sense, but still a theory). It is a way of looking at things, it is not Truth itself. The universe doesn't care how we look at things, it just is. When I experience the universe I do not experience time and space as the exact same thing, nor do my measurements of time and space look the same. I have to put them into the framework of the theory of SR to make transformations between them look like the same thing.
Time and space are whatever they are. I don't need to use a four dimensional spacetime to describe them. Indeed, when I do I make mistakes (see the complete incompatibility of QM and GR, or the complete failure of GR in galaxy rotation curves, galaxy interactions, universe expansion, etc.).
So to think that they are the same thing is not necessarily appropriate outside of the scope where that axiom makes sense.
As far as I'm aware, no one has any real clue what "time" is.