If D:OS 2 limited the learning of skills like the EE does, it would greatly detract from the mechanism of skill book crafting and discourage experimentation both with crafting and trying different skill combinations.
Limiting the number of active skills in combat doesn't reduce the number of possible permutations (the current intent is that a small investment in memory will give the same number of skills as a specialist build in the EE, while focusing on it would give a skillset larger than was possible in the EE).
