No perfect answers, only options and choices, tradeoffs and sacrifices. Just saying that if choosing between no mortar due to weight and three-man team size, or having one of these with 12-15 rounds distributed, among the element, I'll consider one of these, mission dependent.
Of course, they are not an option for me now, and my grunt life was a looong time ago. When we were prepping for air assault into Haiti, one of our mission was to take down the airport. Indirect fire was a challenge due to the weight, team size, time to deploy, etc. I could see these being a good solution for that application, and better than 40mm.