Pretty much the same problem I currently have with FGO. They just have to stuff both Servants and Craft Essence in single gacha. More than once I pulled 5* CS while I would prefer even 4* servants over it. The lore and story is very well written though so it's definitely a plus. Quite addict to it right now.
For FKG... Guess once you can do it, next time it just much easier.
This is, frankly, harder than Nidhogg ex stage since you need all 4 teams to survive on each routes. The last boss is easy though even with somewhat high HP.