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but is it true for case not violating absolute rating and exceeding recommended operating conditions?
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This question sounds rather theoretical to me, at least in case of a 3.3V I/O standard. Typically you get some additional overshoot, and should rather worry about violating the maximum ratings. In case of the the single ended I/O standards, I wouldn't expect particular problems, if you manage to stay precisely in the maximum rating intervall. I guess, there are much more designs out there, that don't actually keep maximum ratings and still work. As a simple mean of reassurence, many designers simple don't measure some critical signals...
Recommended operating conditions can be expected as an issue with differential I/O standards, e.g. keeping the common mode range or the differential voltage level. I have seen e.g. LVDS receivers still working without a termination resistor. But it's very unlikely that the timing specifications are still maintained in this case.
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