Could probably word this better --- It doesn't *use* an isolate scope, it *is* an isolate scope. I also feel like the sentence is a bit long, the `unless...` clause is a bit clunky.

How about something like

> An isolate scope is the exception to this rule, and does not inherit properties from a parent scope.

Or even simpler

> With the exception of an isolate scope, a scope (prototypically) inherits properties from its parent scope.

But I don't like that as much