you failed to mention that Kotlin has platform types only if it's interoperates with Java. Platform types are for objects that come over from Java code (and therefore have unspecified nullability (assuming the Java code doesn't use nullability annotations)). Admittedly you provided a link that explains this, but how many people will follow the link? And yes, this detail feels kind of important. And yes, future Java (and Kotlin) will only have their version of platform types to interop with old Java code.

As a long-time Kotlin user I can only say: Nullability is nice! Once you know it, you won't want to code without it.