For blackberries at home or in hedgerows, picking only the black ones has always been good enough for me. For raspberries, it's important that they come off the

For blackberries at home or in hedgerows, picking only the black ones has always been good enough for me. For raspberries, it's important that they come off the stem readily. Maybe commercial pickers need to optimise differently and could pick every day and get every berry at its absolute peak? But I doubt that's the state of the art with human pickers at the moment: they get paid minimum wage and are assessed primarily on the weight they pick.