I thought that the article you posted didn't really apply to the phrase "by yourself". The examples quoted there sounded much more grating to me (using "myself"

I thought that the article you posted didn't really apply to the phrase "by yourself". The examples quoted there sounded much more grating to me (using "myself" as the subject of a sentence for instance). I'm certainly not in a position to argue in favor or against the question if "by yourself" could ever be "correct" grammar in the passive voice. An easier question would be whether "you can repair it yourself" sounds cleaner than "it is repairable by yourself". And there I'd certainly agree.