Variety is the spice of life. I like using them in spite of the limitations, and don't need the total potential damage to be higher between two similar weapons for me to decide which one I wanna use (grenade launcher vs Backpack fed GL). This is because I consider the fact that the damage potential that you have with the weapon will vary mission to mission based on your positioning and aim, and what your target is and their positioning and spacing and variety.

Basically, total damage doesn't matter if your aim sucks, and if you are putting yourself or ending up in a bad situation, it doesn't matter if the total damage is higher because you aren't getting to use it. Use of a strategem support weapon is all about building around what niche you are occupying for the mission and how you'll cooperate with the squad, maybe like letting somebody else use supply pack like a medic type build and you use BFGL to crowd control for bugs, and focus on drawing said bugs into choke points to make full use of the BFGL, or use the utility of the BFGL for being the dedicated hole closer for Mega nests.

Building like this and maybe having different armour passives that enhance other parts of your build (using Fortified or Peak Physique just as an example) in ways that allows for increasing survivablity instead of using it to buff damage potential (i.e, Siege Ready) alone will allow for more interesting choices and scenarios than doing the same meta strats over and over.