The game scales pretty well at the low end. Keep out fo trouble and pick you fights in the starter Siddy, maybe all the way up to Master or Dangerous. I think it was 2.1 when they introduced the encounters based on your combat rank (or best of the other 2 with some limits). For a lot of people the original 2.1 release was too hard (I liked it but there you go), so the egineer mods were dialled back (and the bugs that gave mega weapons removed).
All great but there is a lack of high end challenge and multi-player challenge outside of PvP. I would like to see that addressed, but keep the scaling they have now for the "journey" part - it is easier after the first journey but this more about knowing when to press your luck and when to press the J key.
Simon
There are a lot of misunderstandings about the mythical 2.1 NPCs. For some they were extremely difficult. For others, they weren't.
This was due to a bunch of bugs in the engineered weapons of the NPCs. From reports on the forum, it seemed that high ranking Pyton pilots were particularly exposed to these NPCs. Some of them had rapid-fire rails and plasmas that melted ships in seconds. Far beyond any super meta PvP ship we have now.
This came at a time when no one were properly engineered yet. Slow ships were very vulnerable.
For other player that didn't fit in the category where you got interdicted by the bugged Elite NPCs all the time, the 2.1 NPCs were fine. More challenging than now, but not OP.
It's a pity that we never really got to see the well engineered NPCs, without bugs. I don't think it would have been to bad for for the common player and it would have been more challenging for experienced combat pilots.