And that was less then 5 years ago, and it was a Stop the World GC until less then 2 years ago updated to Incremental. While Mozilla's has had incremental for a year and are still working on Generational Collector.
The point is, apart from Java which gets many cooperate backing, even the most widely uses programming languages only recently had a decent enough GC implementation. As much as i hate this slow progression, most VM still dont have GGC as default at all.
