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Asserting that Solaris has weirdness is an insult, because Solaris is the AT&T System V Release 4.0 reference implementation. Solaris is also the reference implementation for libc functions like malloc, threading, realtime kernel implementation, NFS, NIS, containers, shared memory, SCSI, fiberchannel, high performance TCP/IP networking, network virtualization, parallel service startup/shutdown, POSIX compliant shells, POSIX AWK, XPG4 and XPG6 userland, I could go on and on and on; if you want to write an implementation of some IEEE, POSIX or RFC specification, or some kernel or userland subsystem, Solaris / illumos is the place to refer to on how to do that, and how to do it correctly.