mayby because i consume 8 food per person ? because i simply love everyone happy and have super morale ? with this food consumption and everthning maxed except food production) i allready hit the ceiling with small increase of any resource (food stay same, carbon 32, clean water increase only by 61 units, energy 186), and since you need a lot of energy for manufturing...so yeah lack of energy storage is limiting, in times in which you just gather resources for manufaturing you manytimes find that you simply lack enough energy to manufature what you want once you have all needed resources.If you researched everything and you now have issues with storage it means you didn't bother to calculate the amount of resources each improvement brings / consumes and just built it because you could.
Here are some numbers:
Food:
You can have max. 13 people in bunker => max. food consumption / day at 4 units / person is 52 units of food.
Each tier of greenhouse or replicator brings 8 food on the table.
That means you need production buildings to have 7 tiers combined for 56 food / day.
Like tier 5 greenhouse and tier 2 replicator. Or tier 4 greenhouse and tier 3 replicator.
Each tier of food building require 8 water to function (besides energy).
So for 7 tier of food buildings you will need... 56 water.
Water:
13 people at 2 units of water means 26 units of water consumption / day
Add 56 water from food production, you get a grand total of 82 units of water used / day.
Each pump tier brings 25 units of water.
Each purifier tier converts 25 dirty water in 25 clean water.
Your 13 people produce 26 units of dirty water.
That means you need a max. tier 2 purifier and a tier 3 pump and you will still have a daily increase.
Energy:
Each solar panel tier means +25 energy.
Each wind turbine tier means +10 energy.
Each tier of greenhouse needs 2 energy. -> tier 5 greenhouse -> 10 energy
Each tier of replicator needs 8 energy. -> tier 2 replicator -> 16 energy
Each tier of water pump needs 2 energy. -> you need max 3 tiers -> 6 energy
Each tier of purifier needs 6 energy. -> you need max 2 tiers -> 12 energy
Total: 44 energy.
So all you need is a tier 2 solar panel and a tier 1 wind turbine (because you will need energy for quests)
Storage:
Each storage capacity upgrade brings 250 units of storage / tier besides fridge with only 50 / tier.
Why exactly do you need that much storage when your daily turnover is less than 100 for each resource?
so yes, in some styles of gameplay lack of enough storage capacity is limiting.
add to it that you consume energy/carbon/food for gifts to girls to improve relationship....