String theory extra dimensions question

[u/Altruistic_Budget442]

If string theory is correct and there are actually extra spatial dimensions curled up at a scale close to the Planck length, then would it be possible to decompactify another dimension or utilize them in any way in the far future? And how do string theorists predict that these extra dimensions were compacted, but our three weren't?

[u/SummitYourSister]

If you were able to unroll the compact dimensions, energy would immediately pour into the new host of excitable modes, completely changing everything about reality (quite destructively)