Sorry but I can't agree.... without momentum, any projects stalls, and eventually dies....
However, momentum may not be what you expect!
Most people will take as momentum, the fact that they were able to go from 0.1 to 0.6 without hitting any major issues or difficulties...
For, it's the other way around.... I take "momentum" on the challenges, like my last few ABMaterial threads.... I have ask for help and received it, on a few (most) of them, but then, like in the z-order, the suggestion doesn't not work, and that drives me to explore why, what is missing, and when I get that to work, as I did, I share the new found knowledge and take that "momentum" to advance another notch..
So momentum, although not the only factor to get you from 0 to 0.1, IS an important factor