You could repot or you could wait. Now the explanation:
Some people repot all orchids on arrival. The thinking is they want to see all the roots, and move to a medium with which they are familiar. Some people don't like growing in sphagnum moss. Sometimes the medium it arrives in is old and decomposing, and the plant may require repotting.
But, repotting warm-growing orchids like Phals in winter is not a good idea unless you can keep them quite warm, or you absolutely must repot due to the condition of the medium or roots.
Growing in sphagnum moss is very different from growing in bark. Most people grossly overwater plants in sphagnum. If you can learn to water sphagnum properly, it is in many ways a much easier medium to use than bark. The proper way to water in sphagnum is to moisten just the top surface of the moss, and not soak through the entire pot. The way to do this is to run water over the top for only 1-2 seconds. Start with 1 second the first time. Come back in a few hours and look at the moss in the bottom hole. The water from the surface will diffuse through the remaining sphagnum. The roots will still have plenty of air, but be evenly moist. This is a wonderful condition for Phals. Then you don't rewater until the moss in the pot is almost crisp dry.
If you soak sphagnum moss in a cool winter house it might not dry out for several weeks. It is very possible the roots would rot before it dries out. So it is very important when using sphagnum not to soak it.
Sphagnum breaks down in 1-2 years when watered like this. It starts looking ratty, and compacts down in the pot. Then it must be replaced.
The plant you show has healthy roots. The sphagnum is in good condition. Some people might say the pot is too small, but a Phal can grow well in a relatively small pot in sphagnum.
I personally would not repot this plant now. I don't like to repot warm-growing orchids in winter unless it is absolutely necessary. I would use it as an opportunity to learn how to water sphagnum moss. If I did want to repot this plant, I would wait for warm weather.
If you make the mistake of soaking the sphagnum, carefully pull the plant out of the pot, so you don't disturb the root ball. Gently loosen the roots from the plastic pot with a butter knife if you must. The sphagnum will hold together. Set the plant in a warm area with good air circulation until the moss dries to a crisp throughout. Then put it back in the pot and be careful the next time.
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