[debugnik]

> and a language that has large features that are almost soft discouraged

It's literally just objects, one large (and early!) feature. Arguably too large compared to the rest of the language: first-class modules or polymorphic variants can handle most of their use cases while being much simpler, and faster than the existing class system. (Objects and object types without the actual classes are maybe ok.)

The only other controversial feature I can think of is Seq and that's just because it can be allocation-heavy. Then again ordinary OCaml lists are not much cheaper (thankfully immutable arrays are already in for 5.4).