Twenty years after its premiere, Mark Ravenhill’s dark comedy about consumerism is having a rare revival. Does it feel like a period piece or did it prove prophetic? We asked four rising playwrights to see it for the first time

First staged a year after she killed herself, 4.48 Psychosis was called Kane’s suicide note. As a new opera version opens, the team behind the play’s Royal Court premiere look back – and her brother gives a rare interview about a work that roars with life as it gazes at death