Also, let me clarify why in-system jumps are more necessary than galaxy-wide wormholes... One of the biggest issues related to this is the fact that a lot of the time, when picking up a mission, you won't be able to know how far away the target station is from the target system's point of entry. Whereas, if you're travelling to the centre of the galaxy, you already know the approximate distance.
You can look them up through the system map to see information about your target station.
If you don't have the data for that system, then it's a risk you have to take.
A skilled pilot might be very familiar with their local area, so they might remember what stations have distances that are prohibitive for certain missions.
Creating a mechanic that circumvents this removes an aspect of the game that rewarded skill. We don't need that. There's numerous other examples, and this is one.