Electrically its the same connecting directly or using buss bars , ( providing the correct gauge of cable is used for connections).
The practical limitations are that multiple connections to a battery terminal may/will exceed the capacity of the bolt or stud connection point and over stress the mechanical fixing. Its difficult also to 'stack' terminations as each termination and cable needs exit space. The usual result of trying to make multiple connections is an unreliable system with possible failure.
Its good practice to limit the number of terminations to a stud/bolt to two cables and ideally only one cable.
A further point is for safety and a need to meet codes and regulations, there needs to be over current protection for all circuits connected to the battery. This protection needs fuses or circuit breakers as close as practical to the battery. In practice a fuse/breaker between the battery positive and positive buss bar is used. As for the battery negative its useful to to have a current monitoring shunt in the path, this connects between the battery negative post and the negative buss bar.
typical use of buss bars, note the fuse at the battery positive post
View attachment 55305
Incorporating high current fuses with the positive buss bar
View attachment 55306
View attachment 55307
Mike