You absolutely can do organic soil in small pots, as you've already discovered.
It's just that no-till growing is somewhat impractical in smaller containers. A 1g container of organic soil is going to decompose into compost much quicker than a 10g container will. There's nothing wrong with that really, just gotta mix the decomposed soil with a little bit of peat moss and you're good to go.
The thing with no-till is that no-till growing has certain benefits that you will never see in a ROLS (Recycled Organic Living Soil) grow. For one, certain microbes will only colonize 8-12 inches below the plant itself. So if your pot/soil mass is 6 inches or less then there are certain microbes that you will never have in your soil's ecosystem. Definitely not the biggest deal, but still something to consider nonetheless.
The other major benefit of no-till is that the microbiology/soil web gets stronger and stronger with each cycle, until it turns into pure compost and has to be re-potted of course.
Think of a soil web as a city. In a ROLS grow, you're effectively breaking the soil web apart when you disturb the soil in any way. This could be akin to a city constantly being destroyed, with the inhabitants being forced to rebuild after every grow. Conversely, in a no-till the soil web goes undisturbed. Rather than the city being destroyed after a single grow, it continues to grow and grow until it becomes a full blown metropolis. And, much like in life, a metropolis is going to have certain things that a small city will not.