Most Phals do not go through dormancy (although there are a few like P. parishii that lose their leaves during dry periods - sort of a dry rest).
I have a Phal. hybrid that, if I did not occasionally cut the old spikes, would probably bloom and bloom again from the old spikes, and also produce new ones. As long as the plant is happy and not stressed, I don't see the need to clip the spikes (but you could if you wanted to, to let the plant recuperate). If you do see some indications of stress, then cut the spikes close to the plant to allow the plant to expend less energy flowering.
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