Max, you must have controlled and now fly in your own little bubble of perfection. For the rest of us in the real world there are enough reports/incidents on file to show that these are real issues that need to be guarded against.
If, by adding an extra word on occasion, a level bust is prevented then it's a very small price to pay. The exceedingly brief amount of time it takes to say millibars or degrees is easily mitigated against if much of the other extraneous bolleaux that is said on the r/t from both sides is limited (hello, goodbye, it's the <insert callsign here>, what number am I, errr, umm, etc, etc).