Apologies OP, TLDR got as far as ED is too Grindy and gives you ability to get to end game in a few hours. A truely notable achievment! OK I read the combat bit and it got me thinking.
The numbers of kills per level may be too higjh compared to previous games. In Elite, and both FE2 and FFE the frequency of attack, and hence abiolity to get a kill was higher, and I think the numbers required (assuming we are onyl getting 1.0 kills for the kill in ED), is less. In contrast, ED requires you to "opt in" to doing combat, whether hunting pirates, HaxRes or Conflict Zone. This, with high numbers combined with shocking target selection policy (driven by credits and not NPC raknking) by players leads to slow progress.
If you measure ONLY by credits, nothing makes sense in the game, mining doubly so

If you take the other factors of the game , it makes sense, well more anyway. We have ourselves trapped in the "play my way" for equal reward, rather than I want to achieve "X", game mechanics work like X,Y and Z so I will do X and Z. FD rather fostered this credit obsession, by refusing to actually explain the mechanics (hiding progress bars until 2.x), so we all latched ontoo credts as they were easy to measure and do measure progres in one axis.
Take Conflicts Zones as an example. they pay a lot less per hour than High Res, for much harder ships. Massacre Missions can certainly help form a credit per hour point of view, but do not actually need you to go to the conflict zones, making Haz Res even better with a bit of searching on the Galaxy Map. Conflict Zones change ownership of resources, one of the very few ways we can change the persistent universe. There is a cost to this that reduces the payout per ship destroyed.
This makes sense, but it means Conflict Zones, although arguably more fun than Res Sites, do not earn enough money, so peoepl want a buff. To say ou do not care about the BGS, means you ar eoly playing a subset of the game - why balance for those who only play a subsaet?
Well that is my take anyway. Only got as far as combat and the obsession with "credits" prompted this.
Simon