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by 0xCMP 4005 days ago
I am guessing[1] that GCs are easier to code correctly without the concurrency and that a GC language is already expected to be slower so it doesn't make sense to do a concurrent GC. Also possibly, the language doesn't support concurrency well. Like a Python or Ruby.

[1] just an educated guess. I have no real knowledge of GCs other than skimming how they work in articles and runtime/language docs.