I wouldn't agree to call it "wrong", since we're talking about languages that are trying to discourage you from doing your own memory management *(C#, that is, but I'd say this applies to any language running in a VM with gc, really). Thus, in such languages, there shouldn't be a conceptual or syntactical difference between values and references. The fact that C# allows to differentiate them from each other is a leaky abstraction imho, built in to satifsy people form a C/C++ background.

I believe that whether this is 'wrong' depends on the problem you're trying to solve. In my day to day work the difference usually doesn't matter, and I am totally happy passing around objects that others would call heavy. I am really happy that I don't have to care about references or values when doing scientific python stuff (pandas, numpy, etc), whereas I am also really happy that this stuff is important to people implementing these libraries.