I’m too a beginner but don’t beleive that your Miltoniopsis and Oncidium are in a bad shape. The pseudobulbs appear to be plumbed that is good. As for the wrinkled leaves, a lot of Oncidium have sensitive leaves it should return to normal after a few weeks of being repotted. However, some Oncidium do that very often if they are not enough humidity auround.
About the root they get stained by the potting medium the were in. What were they potted in ? I can see that your Miltoniopsis has some rotted roots but I see good one too.
Cleaning it well for a starter will help you knowing which one are good. What I do, as I’m also learning, I’m only getting ride of the roots that come a part easily with a good running water cleaning and cut of what I’m sure of.
Hope that was a little helpfull until someone with more experience come along
There are rotten roots but as
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