repotting question--trim healthy roots or not

[Berrybee]

hello, i'm repotting an oncidium sherry baby type orchid i got a month ago from trader joe's. to my surprise, after i removed all the medium (sphagnum moss on top and peat moss mixed with perlite around root ball), i found the root system is extensive, and all look healthy with many growing tips along the roots.

so my question is: should i still trim the roots or not, in general and in S/H culture? i'm new to orchid, and after i read many materials online, i decided to try s/h culture. from all the articles about repotting i read online, trimming roots is a step during repotting. But since the roots of my orchid are healthy and growing new roots along the older ones, should I leave them alone?

I also read that roots will stop growing and slowly die off after being disturbed. is that true? i have definitely disturbed the root system a lot, as the old medium was so densely packed and it took me a long time to get them all out of the roots.

thank you very much for any insight!