I would lilke to suggest a mission hub for each system, a place where you can list all missions in the system and accept the ones you'd like to do (you would still have to fly to each station to pick things up etc).
This would greatly improve the confusing mess that the current mission listings provide.
It would be a great improvement if you could also sort by mission type and most important of all: destination.
I find that I spend a lot of time going back and forth looking over the missions trying to find missions that have the same destination.
The issue is the cap on delivery times for missions.
You literally cannot send more than 100 odd missions back to the player before it grinds to a halt, times out and fails to return anything back.
This limit was stress tested in a beta a while back. So the idea that you could return an entire system's mission lists is dead in the water already thanks to that.
The other problem is even if that wasn't a technical limitation, you'd be able to exploit conditions where you don't even have access to a station's mission board normally, or it's riskier to do so e.g due to having a bounty, being hostile, Lockdowns etc.
What I'd rather see is mission boards broken down by type, just like passenger missions are... so separate boards for, say, combat , trade, specialist and crime, as a start point. Then at a single given mission board instead of just 100 random missions, you'd be able to get 100 combat related missions or 100 trade related missions... instead of rocking up to an extraction economy run by a corporate faction in boom with your trade vessel, and getting a board full of assassinations. You could then go down the path of making certain categories available/ unavailable depending on government and state combinations, because right now there isn't enough material difference between boards given those conditions.
Lastly, you could also break down by faction, and return just 20-odd missions of a type, for a specific faction. Board generation times are loosely O^2, so 40 missions takes 4 times as long to deliver back to the client as 20, so by generating just 20 missions of a category for a single faction would dramatically reduce board load times.
This was my last post about this, and it's all still relevant.
https://forums.frontier.co.uk/threads/overhaul-of-mission-board-ui-and-mission-lists.456902/
In addition, here's my videos demonstrating the difference in load times between 100 missions and 20-odd missions
Source: https://youtu.be/1v-jOhfNcbc
Source: https://youtu.be/Ljs4RR4fJRU