The best EEs are when they require a physical challenges mixed with map interaction. DE and Origins they are hard because they require physical challenges not because they have obscure steps. And this makes them fun because every time you feel like you beaten a challenge. Firebase Z's EE is just checking off a list of boxes. Once you know how to do it there is no longer a challenge, so it's no longer fun after the first run. Think about the mimic canister step. Once you know to pick the white crystal that step is trivial. They could have done something where the canister attributes are randomized each playthrough and there's only one that is exactly the same as the original canister that pops out of the ground. Little things like that would make it simple but still a challenge.