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Liquid propellants.
Short answer "They blow up" have not figured out how to create a controlled burn much less a reproducible, consistant controlled burn.
Been working on the problem since the 1940s.
Does this answer your question?
If not,
Do you have a basic understanding of how powder works in a combustion chamber?
The differences of burn rates, ect of flake, solid pellet, perforated pellet and multiperforated pellet powder?
And what makes different powders better for different missions?
Not trying to be condescending, just don't want to bore you and others with information that may be unnecessary. Ie, Trying to establish the baseline of knowledge
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