This whole concept goes beyond simply playing an instrument. Rather, it’s a basic awareness for our senses.

When a stir fry is very salty, the palate becomes desensitized to the salt and you won’t notice it anymore. In this case, an absence of salt almost adds more flavor/contrast than the inclusion of it.

Likewise, if you add vibrato to every single note, the sensory stimulation from that ‘technique’ will fade, to which the tone without vibrato will have more contrast.