Why a starter should not arrive late before main meal

I went for a meal at John Dory Pavilion.I placed my order ..which was just a simple hake,fish n chips. The waitron. asked if I wanted a starter..so I said yes. The starter of a simple cheese melted bun..took 15 Min to arrive ..then the main meal 5 Min later. It is not good customer service!! Starter should be within 5 to 10 Min..cos a person is hungry so one appeases the hunger by the starter ..it doesn't make sense to eat yr starter then yr main meal arrives 5 Min later.. Please train staff to be aware of these scenarios