Regarding the 100% imbalance issue
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If the UPS system provides a three-phase four-wire or three-phase five-wire output for the instrumentation sector, this sector carries out a rough allocation of the load based on the actual usage requirements, in order to ensure phase balance. However, the UPS system has the concept of 100% imbalance, which means that one phase can have no load at all while the other two phases can be under full load. I need some help.
From a theoretical perspective, the question you raised is indeed true. But from an engineering perspective, this is not allowed; even if imbalance occurs due to external factors, it can only be temporary!