Point 2... yeah, that's one of my major problems with Java. Unnecessary boxing and the unreasonable amount of complexity if you work around it. In any type of Object collections, it consumes memory, stresses garbage collector unnecessarily and causes a lot of CPU cache misses.

Value types would help so much with this issue. I know they're coming one day. I hope Java/JVM can replicate memory efficiency and cache coherence of C++ std::vector for small objects.