What it points out is that even a good random number generator can be used incorrectly, and without the right tools your efforts to produce truly random numbers are doomed from the start.

C++ has an embarrassing wealth of random number generators. The Ruby core has almost nothing that can measure up to that, yet it seems like a huge oversight.

I like that C++ has a generator for many different use cases, they all have their reason for being there, but Ruby has a singular one with unknown properties. Porting over what C++ has and making a proper Random library for Ruby would make a lot of sense here.