synchronized - shared but actually useful

[FeepingCreature]

Update to previous post:

synchronized class Class {
     void foo() @safe { }
}

void main() { auto object = new Class; object.foo(); }

This errors because object is not shared. Why is that a problem? 
It's not shared, but it is synchronized; there is no possibility 
of a threading issue here.

Analogously, I cannot do

synchronized class Class {
     private Class object;
     Class foo() @safe { return this.object; }
}

either, despite the fact that Class is again synchronized and 
thus should be able to be treated as shared implicitly.