Structs seem like a very pragmatic solution to the truly hard problem of writing a really good GC algorithm. Java has a whole selection of very advanced GC alg

Structs seem like a very pragmatic solution to the truly hard problem of writing a really good GC algorithm. Java has a whole selection of very advanced GC algorithms, and from what I hear, it's possible to mitigate most long-pause problems by careful tuning (e.g. incremental+parallel might help here). But JVM tuning is such a black art that really nobody knows how to do it ... TL;DR worse is better.