The difference, of course, is that dispensationalists believe their division is divinely inspired, and provides a valuable, indeed, necessary way for organizing one’s theology. Further, if you disagree with their understanding of the divinely inspired division, you will completely miss the mark of basic Bible interpretation. IOW, it provides a hermeneutical framework that is essential for reading present-day prophecy tea leaves.
I must be a renegade dispensationalist. I don't think my categories are divinely inspired. I think they're cognitively helpful in ordering and organizing.
I don't see any reason to believe that anyone's categories are divinely inspired.
That doesn't mean, however, that they aren't legitimate.
Eden really was a separate time. From Eden to the flood really was a separate time....not that anyone has a whole lot of data on it.
for reading present-day prophecy tea leaves.
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No, for basic understanding or present-day Biblical prophetic truths and realities.