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since internal paths are constrained then there is no issue there.
The io paths are not constrained and are unknown.
the compiler ends up with figures for tsu/th/tco at io as achieved by fitter. Whether this is good for your io or not is a different matter. Moreover from build to build it will change. So it is not recommended anyway. If you are not sure about io constraints try some arbitrary figures rather than leave it unconstrained.
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Kaz, do you mind elaborating more on this part as I am not familiar how I/O timing works with regards to tSU/tH/tCO. Does that mean fitter will randomly assign some values for those if unconstrained?
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