Correct learning will always be for the better.
There is not much to gain in bi-wiring (as to improve a system). There can be more to gain in having those bi-wires combined to service both LF and HF. This can be validated both mathematically and experimentally using tools to give you measurement.
The only probable change a bi-wiring can do - if different gauge of wires were used, thin for tweets and heavy for LF - is that a probable resistance was inserted between amp and tweets, resulting to lower HF output. This is if we assume that short cable runs from your amp to speaker really provide substantial resistance between your amp and HF/LF (this is debatable).
As usual, listening is relative (subjective). What could be better to somebody might not be better to another. Thus, even if bi-wiring 'SEEMS' to provide to someone who thinks it resulted to better sonic (his ears' reference), it may not at all be true to another.
Chances are, even that BETTER sonic may not be existent after all - we have short memory on sonics, which can hardly decipher/compare (which?) DETAILS.