Yes and that would be a correct claim. Unless one assumes that a language is objectively "good" or "bad", in which case, rationally speaking, we would only be using "good" languages, which is clearly not the case. Ironically the same happens with natural language. In theory we should all be using Esperanto by now, in practice English as the de facto international language is totally fine.

The main difference with JS is that we don't know whether it would be so commonly used if it wasn't for browsers. Still, it seems that the majority of efforts are towards augmenting JS' capabilities rather than finding ways to use alternative languages on the web (yes, I'm aware of WASM and maybe in the long run this statement will be proven false).