As a person with southern Chinese tastes, I am very picky about (East Asian) soups. Anything that tastes like water, or lightly flavored water, is not acceptable to me. I don’t always have the time to do a double boiled Cantonese soup either.
I just made a fake tonkotsu soup with some broth, and homemade (unsweetened) soy milk. It’s all about layering flavors.
Borrowing a leaf from the Japanese ramen playbook (where a flavored ‘tare’ is a big part of the top notes of a soup, I did a garlic confit in some fat / oil, then reduced soy sauce, dark soy sauce, scallions, ginger, and combined the liquids before serving.
There are so many East Asian soup techniques. Many of them have overlaps.
My favorite will still be my grandmother’s peasant / struggle soup base: a bunch of mince with a handful of dried anchovies and spinach. The taste of my childhood.
Dries soy beans, dried mushrooms, are all easy ways to bring out lots of flavor cheaply too.