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Changing the default userspace memory allocator for a distribution is less a technical choice than you think: lists.fedoraproject.org/archives/list/
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jemalloc, tcmalloc, hardened_malloc, mimalloc, etc. are as general purpose as glibc malloc. glibc malloc isn't good at any niche. It's not a modern/competitive allocator design. It's not simply choosing different tradeoffs than modern allocators. It's an obsolete design overall.
Almost everyone who caring mostly about memory usage and performance would be happier with jemalloc with suitable defaults for libc inclusion (see: FreeBSD, Android). Essentially no one would replace jemalloc with glibc malloc if it was the other way around with jemalloc in libc.
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