Indexing access for Lists and Maps considered harmful?

[Roel Spilker]

For as far as I'm concerned, for Java7 we could start with just defining the
[] access and assign operators to work on java.util.List and java.util.Map
for now. It is not unprecedented to have specific operator overloading to
special classes, like the + for java.lang.String.

Allowing operator overloading in libraries, as people on this list suggest,
is, if I understand correctly, too big for project coin :-)

And yes, List and Map are not in java.lang. Is that really a problem?