alt Hacker NewsTo be fair, years ago Rails was what all the "bootcamp" programmer mills were pushing. Only you have the full context, but absent of that it is likely that Rails was truly found to be associated with poor applicants. Not because of anything about Rails itself, but because of those "bootcamps" not developing quality people. The culling has to occur at some point. If you throw some great developers out with the bathwater, so be it. There isn't enough time in the day to worry about them.
Admittedly, Ruby on Rails makes me think "bootcamp" like you said, and I barely even know what it is.
But shouldn't the check just be that the candidate has used more than one different stack? It's pretty hard for anyone with real experience to stick to one, and even if they do, that's not a good sign either. Or are you saying those bootcamp people end up learning another stack but still not being very good?