A new admin comes along in 3 years time, and doesn't know the difference(...)
...just makes it feel like you're optimizing for the lowest common intelligence.It's not a mark on the language but rather one on the understanding of your potential successor. Would the same sysadmin who is unfamiliar with [[ vs [, or $ vs @, be handily equipped to do common system administration tasks? Rebuild a degraded software RAID array? Troubleshoot a faulty network interface? Chances are comparatively slim.