So that's mekaki. It's a fairly common thing in Japan when growing plants. You remove weaker sideshoots or growths to promote better flowering (and growth) in the ones you leave alone. Like pruning rose buds down to one, so you get a bigger, fuller, bloom... or removing watersprouts of a fruit tree...?
It's noted that cymbidiums flower better when you remove excess shoots (summer - fall), particularly those that arise in the fall with the flower spikes. I don't really grow cymbidiums but my grandmother (who did) always did that.
Pruning is extremely detailed in Japan... (among many things...) to which # node of a plant one should prune per plant type. Below is a figure from a gardening site titled: "a beginners guide in growing cucumbers". Not that everyone follows that... but these details are commonly described for hobbyists.