The Dwarven Bulwark provides a direct increase to all Boosted Good Production,
As
@Timneh pointed out, you are confusing the Dwarven Bulwark and the Mountain Halls. But let's ignore that and focus on what each AW offers:
Golden Abyss and Tome of Secrets – neither one directly benefits fighters or caterers
Endless Excavation – does not help either
Needles of the Tempest – directly benefits fighters, as it increases the damage of Light Ranged units and improves the training speed of Barracks
Martial Monastery – directly benefits fighters by increasing troop health
Crystal Lighthouse – directly benefits caterers by providing extra goods, but due to the limit of 3 chests per day it is of very limited help
Watchtower Ruins and Thrones of the High Men - neither one directly benefits fighters or caterers
Dwarven Bulwark - helps fighters by producing free Light Melee units and increasing training size
Mountain Halls - helps with catering by increasing the boost for standard goods. The problem is the bonus is applied to the BASE production. That's pretty low. At level 11 the bonus is +72% and the cost to get it to level 12 is 720 KP. That's a lot of KP for just +4% increase in BASE production. The goods production bonus simply can't keep up with the demands for goods in later chapters
Prosperity Towers – no direct help for either
Blooming Trader Guild – I'll have to disagree with you here. First of all, not everyone buys goods from the Wholesaler. Second, the amounts of goods are pretty low even with the BTG bonus, so the help for caterers is minimal
Heroes' Forge and Shrine of Shrewdy Shrooms – BOTH benefit fighters
Enar's Embassy – the most useless AW in the game. Any plans to change it and make it even remotely useful?
Flying Academy – free Mage units and faster training in the Mercenary Camp. Three guesses who benefits from both
Maze of Dark Matter - no direct help for either
Dragon Abbey – increases the damage of Mage units
Temple of the Toads – free units and increases the damage of Heavy Ranged units
Elvenar Trade Center – indirectly helps caterers by increasing the effect of the spell that increases the amount of goods you can produce
Sunset Towers - no direct help for either
Victory Springs – directly helps fighters
Pyramid of Purification – free units
Lighthouse of Good Neighborhood - no direct help for either
Timewarp – decreases tournament cooldown
Simia Sapiens – increases troop production
So, for caterers we have:
Crystal Lighthouse/Great Bellspire and Mountain Halls for direct help, and a few others, such as BTG and Elvenar Trade Center, for indirect help
For fighters we have:
Needles of the Tempest, Martial Monastery, Dwarven Bulwark, Heroes' Forge, Shrine of Shrewdy Shrooms, Flying Academy, Dragon Abbey, Temple of the Toads, Victory Springs, Pyramid of Purification, Timewarp and Simia Sapiens
Of course, more AWs means more space needed, but on the other hand fighters don't need as many goods. Caterers need to produce more goods to make up for the rapidly increasing costs in later chapters, and for that they need more space.
In short, yes, we do need something to help with catering, be it another AW added to an early chapter, or a temporary building that boosts the production of all manufactories, similar to the temporary buildings that help with fighting.