Hi there. Me again. I haven't had the best of luck with my Onc alliance in s/h but I suspect it is due to my fertilizing and watering. What I do know is that in my personal experience, Onc alliance chids don't bloom as well unless they are really overgrown or tight in their pots. They seem to really like that. (others chime in if other opinions).
Once I realized that and put all of my Onc alliance chids in much smaller s/h pots, (and fixed my fertilizer) I finally got a really nice spike on my Onc Gold Dust which is ready to open very soon.
I am pretty sure that most Onc. alliance like LOTS of sun. I have all of mine at the highest part of my shadehouse and even have supplemental light on them for the winter. You can tell if you are underwatering if they throw out wrinkled leaves. Once I figured out the light and the pots, I also discovered that they hog the water (probably because they are tight in the pots and the humidity is down due to winter here). So I am supplementing with extra humidity too (the SHouse is holding steady at about 60% average).
I tend to repot whenever I get a new orchid but in this case, I agree with Zoi2. Check the roots. In my opinion you don't need new roots but you definitely want good roots. If the medium is trashed already (used up), then it is beneficial to go ahead and get the chid into a better enviroment (whether s/h or orchid bark or whatever).
If the roots are bad (black, brown icky), then I defer to others who are more experienced with Onc alliance than I.
I do know that I purchased some bare root cuttings which were basically dried (but good roots) and I plopped them in s/h with no issue. Now I haven't bloomed them yet but I expect that they will bloom next season.
Good luck.
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