Yes, one is an accidental pain in the ear that can carry on for hours on end, and totally jam the frequency, and does no good for anybody.
The other is an intentional pain in the ear that familiarises studes with the procedure, encourages them to use the facilities at their disposal, helps controllers stay current with the RT/phone/liaison and triangulation procedures, and can be cancelled at any time that the frequency is required for an emergency.
OK, some "hot shot" pilots dislike students impinging on their nice comfortable worlds, would prefer to forget that they were once studes whose RT was slow, hesitant and unsure, and would prefer them to be neither seen nor heard.
It is generally considered that the British system produces the highest standards in the world. Having seen standards in many other parts of the world, this is certainly my view as well. How far would you like standards and safety margins here to be degraded?
Those who dislike having to listen - you don't have to. Stop whingeing, have a bit of sympathy for the tyros and trainees and get a life.