Dark matter has a very simple and literal explanation, matter affected by gravity (thus below the speed of light) that we arent able to detect. This could be almost entirely mundane things like planets of asteroids that are impossible to see at lightyears if they dont pass in front of a star.

Dark energy is the odd one that is part observation, part speculation

In our Solar System, planets, dwarf planets, asteroids, space dust together hold 0.15% mass. The rest of the 99.85% mass is held by the Sun. I think this mass distribution is uniformly true for other stellar systems as well, where majority of the mass is held by the stars (singular, binary, collapsed) and very small amount by other objects in the system.

Given the above, why is there so much postulated "dark matter"?