There should be limits on sound level to be obligatory at all discos. DJs must obtain their own feed back from the seating or standing positions of the guests. It should not be necessary for participants to have to shout at each other to communicate.
So that people can have conversations at parties and weddings.
So that peoples' hearing will not be damaged by thoughtless DJs.
So that live bands and music which play at reasonable sound levels can prove their superiority . To enable real musicians and singers to make a living against DJs