They make it sound easy - just improve your photoing technique! I found after months of trying everything with building interiors, really no luck. Even with quite knobbly cracked old plaster RC couldn’t find anything to consistently catch onto. Not only ‘featureless’ areas, but linear objects too, where one bit of the linear was hard to distinguish from the next.
To me, this spoiled the building-interiors use of RC that I was hoping for, so gave up. Tho other folks like Götz Echtenacher seem to make a professional success of it, it defeated me.
The only way I could get building interiors photos to align reliably was to pin screwed-up balls of colourful patterned wrapping paper to the surfaces at say 50cm spacing. Then RC could see and distinguish several in each photo and could align to them - and the plain surfaces between were also happy. But that was much too slow and laborious for professional use, as a fast alternative to traditional measured survey of building interiors.
It’s worth mentioning that Alignment is only for the purpose of aligning the photos - unique to RC AFAIK, the resultant sparse point cloud is not used at all for subsequent stages - once the photos are aligned RC starts all over again to construct the mesh (and later texture it) by other means.