May be old for you but not for the Armies who still have to fight conventional operations.. There is a difference between assault weapon and personal weapon such SMC and pistols carried by soldiers who do some other major activities other than firing assauly weapons ... like LMG carrying or RL fifring soldier. He can not defend himself when enemy is 50 yards away from him. Hence he needs to carry an addition small weapon due to weight. You gave an example of countries which would never ever fight conventional trench warfare but only are required to carry out expeditionary operations. We are talking about India, my freind Kunal. Keep the context in view rather than what is being followed by UK.