If I'm bringing in allies, that means I have to bring a mandatory troops choice.
Most troops are brought for their scoring ability over their damage output. There's only a handful of troops in the game which are true workhorses (Basically GKSS, GH, Immortals, and Veterans), and the armies which have those 'workhorse' troops are generally very widely allies of convenience- or I'd rather just play those armies as a primary.
There has to be a REALLY good reason to spend points on a troop choice that cannot score- and I have yet to see a list that has one. So no, i wouldn't bring Desperate Allies, especially when the Imperial Guard are perfectly willing to ally with most codices anyways.
"Knowledge is knowing tomato is a fruit. Wisdom is not putting it in fruit salad."
Also known as BaselessElm