Not really. Snipers? Insurgents could just hide behind sand bags. Manually launched mortars wouldn't be as accurate, wouldn't have has much ammo readily available, wouldn't have anywhere near as many submunitions, would require more manpower who would be exposed, would take much longer to fire off just as many projectiles (within the same time span of launching one rocket), and the purpose is to impede movement by laying anti-personnel mines, and not to detonate on impact. Why would you need additional impact drones, when the rockets would have more fire power within them, and Russian MLRS has rockets with observeration drones built in to them.
If insurgents are encamped behind sandbags then they are already trapped. if you want to eliminate them, the sniper can call for a mortar or air strike. The MLRS has its purpose but the collateral damage in urban environments is very high and you have to sweep the mines when you go in to take the area. Too me mines are an emergency tool. When you are at risk of being overrrun by superior numbers, then use mines.