depends on the nature of the opinionated tool I think. If it's opinionated in the sense of boiling down well known concepts to their essence it aids in learning, say Clojure to me is like this.

On the other hand if it's opinionated in an esoteric way it can be quite hard. I remember a HN post about some decentralized chat app that had a language called 'Hoon' I think and it read like someone had reinvented Malbolge.