I mean, the language is what it is. But, it definitely constrains the language developers. Especially when considering interop with other JVM languages.

That being said, it is easier to write a language on top of the JVM with good interop, since there are less ways to implement features. Essentially, your language has to interop with Java.

And it is harder to have good interop between CLR languages because there are more ways to implement features. Essentially, your language has to interop with C#.