I just really dislike the bag mechanic. True or not, if FEELS like I'm constantly fiddling with the chaos tokens. I don't like it. I wish they had gone with a different mechanic. The fact that the number of tokens varies so wildly makes it hard to come up with a practical alternative. I'll probably give one of the apps a try.
The bag mechanic offers a great deal more flexibility than a die would, including the ability to add or remove tokens due to campaign progress or even mid-game effects. The only other way to do that would be a lookup table, which would get old fast.
We've already started to find the bag excessively fiddly, and will probably be trying an app soon.