Radio Phraseology
All seems pretty simple to me. Many aircraft accidents over the years have been found to have been caused by the use of non-standard radio calls leading to confusion, not only between different aircraft crews, but often ATC-Crew comms.
Being "cool" is fine, however when it comes to issuing instructions - clearances etc, and acknowledgment of same, there is no substitute for standard phraseology. It simply removes any ambiguity, FULLSTOP!