Phals in moss not reported for 5 yrs

[EarlV]

I have a few Phals like the one in the picture that have not been reported in 4-5 yrs. They are healthy. They started out in moss but it is all rotted away now. The pot is just filled with one big root ball. I tried last month potting up one from a 4 inch to 6 inch but killed it. These were not reported basically out of fear. I kill 50% of the orchids I repot. Given they are happy should I just leave them as is.