It's used to implement pthread_attr_getstack to get the main thread stack base but not sure if anything interesting uses that. CopperheadOS calls it in libc init to save the main thread stack base for use in the dynamic object size checks (fast path for data on current stack).
it would probably be easier to run out of resources that way? if the disk is full and the crashing app uses 50% of RAM?
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ptrace / /proc/$pid/mem gives you arbitrary read, pipe core_pattern doesn't
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Now that debuggerd is gone it doesn't really matter anymore beyond forbidding self-ptrace which isn't very important.
End of conversation
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