Is E-ticket still needed when flight and seat reservations already assigned?

The basic idea of eticket is to reduce on paper and to make the accounting of the flown tickets immediately. However there are some situations when the booking does not get processed properly or the reservation is cancelled due ticket number(which is mandatory to hold the reservation safe) is not fed in by the travel agent. In such cases your eticket printout will help you save your day. Nowadays many airlines give you the option to check-in online and even printout your boarding pass at home before you reach the airport. If you are travelling only with carryon bags then you do not even have to go to the check-in counters. You can walk straight to the gate with your home printed boarding pass.