You're asking the orchid community about fertilizer/fertilization, there will likely never be a consensus.
In a very general sense, if you're dealing with plants that don't go dormant or require a rest (i.e. the average florist phal) , and if you have healthy (and especially if you have actively growing) roots then it's okay to fertilize (with a multitude of caveats).
If the roots are unhealthy, dying, or dead then it's basically worthless to fertilize the potting mix. If there are few to no roots actually in the potting mix, then it's basically worthless to fertilize the potting mix.
Additionally, there's essentially no harm or risk in holding off on fertilizing for a few weeks or longer, especially in regards to epiphytic orchids that tend to be light feeders to begin with.
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