In the sense that there are no types (or only one, depending on how you look at it), that its inventor eschews standardization, that there are literally no keywords and that the basic premise of the language is that it, the interpreter, the application and the compiler are the same thing, it's not at all opinionated.
You make an interesting point, but what you describe is about the only sense in which I'd respect calling Forth opinionated. In every other sense, walking into a new Forth application is potentially like walking into a new language.
As a good example of how unopinionated it is, here are the jonesforth implementations of the IF and THEN words:
: IF IMMEDIATE ' 0BRANCH , HERE @ 0 , ;
: THEN IMMEDIATE DUP HERE @ SWAP - SWAP ! ;