Basically, there's two purposes of WC:
1. To lower/control the nutrients in the tank
2. To replace the trace elements
Some have to do WC for both the reasons while others have to do for one or the other. Reactors, depending on the filter media, can cut down your wc due to number 1 but not for number 2. But if you use calcium reactor to provide all the traces and major elements along with a denitrifying media in a reactor, theoretically, you can lower you wc by a significant amount if not at all.
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You wouldn't want to see my tank. I don't use fancy equipment and I am a noob 
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