Old and new.
The game is roughly 8/9 years old.
The mod is not as old but it is over 5 years old.
Consider that some systems are over 3 years old, even some are older.
Our knowledge of the game and mods for it is far greater than it was even 2/3 years ago.
It isn't only knowledge and techniques that have got better though.
Gallia is something that we had to finish as so much had been put in already. Unfortunately that meant it pretty much ate up time. Lack of motivation and thus organisation led to further issues.
This meant that Sirius took a back seat, so many systems were ignored.
Guard systems are extremely hit and miss, due to different developers doing them, different plans by factions and different levels of skills involved in making the system.
Overall:
Time. Skill. Knowledge.
We didn't have enough of the first, we've gained a lot more of the last two compared to the systems you might be disappointed in.
One thing that you could do to help though is to list the systems you think need looked at.
Whether it be starspheres or other stuff, please list it.
We'll look at those systems when bug fixing is done to a good enough point.