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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.
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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.