Quest Energy
It's unfair to have EVERY single path in an Event Quest chapter require more than 70 energy. I would actually argue that no path should require more than 70 energy. Add extra paths if you want to make things longer, but to create a situation where people either have to be able to request energy help or use a refill in order to just complete a single path that you started with full energy--that's just not at all fair.
I would happily spend units to finish a quest more quickly, or to complete additional paths, but this month's event quest is not designed fairly. And when you add the rifts in, which also require energy, it compounds the problem.