student34 said:
I think there is ambiguity when you say "But roads are in different places on a map when I rotate it!". This does not seem true by how I am interpreting it.
Then you need to think very, very carefully how you are interpreting it.
For example, suppose I have a 1 square mile area of the Earth with one road through it that runs north-south in a straight line. If I draw a map of this area with north at the top, the road on the map runs top to bottom on the map. If I draw a map of the same area with west at the top, the road on the map runs right to left on the map. The road is "in different places" on these two maps under the simple, obvious interpretation of those words--top to bottom is different from right to left. And this is the
same sense in which you say the lines are "in different places" in the two diagrams of spacetime that you drew in the OP of this thread. So under this simple, obvious interpretation of "in different places", the two cases work out the same and there is no problem.
Now you want to interpret "in different places" in some
other way, so that the road on the two maps I described above is
not "in different places" on the two maps, even though it runs top to bottom on one and right to left on the other. You can of course interpret words however you want, but you should stop and think very, very carefully about what you are doing and why you want to do it. If you
do adopt this new interpretation of "in different places", then the simple, obvious implication of this new interpretation, whatever it is, is that the lines in the two diagrams you drew in your OP are
not "in different places" either. So the two cases still work out the same and there is no problem.
You, however, seem to think that there
is a problem: but I submit that the only reason you think that is that you have not fully thought through the implications of what you are saying, but are just, as I said before, saying whatever things pop into your head without taking the time to consider whether they are actually true or even make sense. And so this thread has gone on for a hundred posts and you are still confused, because you are insisting on confusing yourself desipte all our efforts to help you.