Random Access Memory (RAM) is a block device, why Linux uses a character device file instead of a block device file for user-processes to interface with
$ ls -l /dev/mem crw-r----- 1 root kmem 1, 1 Jul 24 19:05 /dev/mem
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The answer is in the question: RAM isn’t a block device, it can be accessed and modified without constraints (physically) and doesn’t need any buffering.
/dev/mem on Linux is handled by
drivers/char/mem.c which implements a number of character devices: