I'm fairly new to this too, but all your bulbs look good, except for looking a little wrinkled. I don't think you should remove any unless they are definitely dead or you want to divide the plant. Again not sure, but your medium looks quite new? If it was repotted just before you got it that will have been a bit of a shock. That and change of enviroment might lead to a few ariel roots going crispy.
I have a Brassidium, though I don't think it's the same as yours (Spider Stars 'Toscanna'). The ariel roots on mine dried off too, but I'm not worrying too much as it seems healthy otherwise. I am finding it seems to be quite thirsty compared to the other 'cambrias'/oncidium alliance hybrids I have. I haven't repotted mine yet, but I may do in a month or so: mine came flowering, and has just finished and started new growths. Apparently the best time is when they are just putting out roots, as then the plant will be able to recover quicker from any root damage. It looks like you might have a well developed new growth at the back in the picture? If so bear that in mind when thinking about re-potting.
---------- Post added at 12:17 PM ---------- Previous post was at 12:10 PM ----------
PS: more thoughts... my experience so far is that phals probably wouldn't mind if you took them out of their pots and took them for a walk round the block every day. Cambria types are much more sensitive though. Unless there's a suspicion of a problem (eg maybe a spagnum ball in the centre, old medium) I wouldn't repot. I think your plant looks pretty healthy and happy overall. In the first pic, though it's a bit blurred, I think I can see green root tips. That's good! As is the healthy looking growth at the back.
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