Vegetable Broth for Freezing

Everyone knows how to make a broth. Vegetables, water, bay leaf, herbs.
We simmer it slowly, etc. But here's the thing, vegetable broth has always been a base for my soups, but it was never edible on its own, it always lacked something to treat it like a rosół (traditional Polish soup).
And then I discovered (or rather probably read somewhere) that you can sauté the vegetables before boiling. Just like that, in a pan, not too much fat, and one after another, chopped, they slowly land in the pan and then in the pot.
It's best if they get a bit charred, a black crust is the thing. Especially onions and leeks do the trick.
The process is long, as it takes a while to sauté, and I make a lot of broth. The taste is 5x better, and the broth turns brownish, although marketing rules would dictate to write - 'golden'.
It looks great, and when slightly enhanced with soy sauce, it tastes like rosół. I make several liters of it - some goes for immediate use, and some for the freezer.
It's tasty. My vegetarian daughter likes it.
Is it healthy? I doubt it, although well, vegetables 😎