Growers, mostly ones that grow in a greenhouse with thousands of plants tightly pack moss to ensure that the plant aren't drying out too much.
It allows them to go longer without wasting water. They like to take advantage of the moss's tendency to hold water for longer, so they would use less water and gain more profit.
In the home, we have less light, and tend to water more. It will be fine in that moss, if you are careful not to overwater. Wait until the whole entire rootball is dry then water.
If you do decide to repot, repot in moss too. I find that moss to bark is sometimes a big step. Repotting in flower will cause no harm. Phals are really forgiving plants, and as long as you don't cut too much roots, they will be fine