I know it probably sounds silly. The idea is to cut the branch off the trees with proper tools (tree pruner, pole saw or whatever), that's easy, takes a minute. What is not so time-friendly, is cutting up the branches that are already on the ground. I need them to be in small and manageable pieces to fit in bags so it can be taken away economically as "green waste". I have no intention of buying a chipper at the moment. A chainsaw is overkill, and I wouldn't want to buy a reciprocating saw just for this. For really small branches I'd use secateurs or loppers. Whenever loppers are necessary, and around 2.5-5cm in branch diameter I think it would be faster to use my battery-powered jigsaw.
For example, I have this blade: Bosch t144df
If it's not such a good idea, why?