It's like seeing a c++ codebase riddled with macros. Is c++ directly responsible for the madness? Probably not, but the tooling allowed it.
And Ruby takes a double whammy on this front because Rails was really what drove the popularity. Hard to describe the frustration of hitting a very large Rails codebase and literally not even being able to find the definition for a class because it's got a fairly generic name and is getting auto-loaded in the bowels of the codebase by someone who thought they were clever like 7 years ago.
It's like a special version of DLL hell. Or all the pains of global window/self vars coming from script tags in JS, but at least that gave some breadcrumbs, and the ecosystem is generally moving away from it even if ESM is still painful in a lot of ways.
Either way - I don't like hidden things. I'd much rather see the sausage get made then try to save a couple lines of typing, and the older I get, the more I judge languages on the simple metric of "How well does text-based search work for finding relevant code?". Rails performs really badly on that metric.