This is all fine and all but what most of you suggest if forcing combat on people who do not enjoy that... I agree that interdiction are simple time tax - I hate it, but making anything harder for non-combat players is not the right thing to do... I am not planning to fit any guns on my trader Python even if I am capable to shoot targets in HazRES in my Chieftain...
I agree that it's important to not force combat on players but I personally think that choice should be entirely complicit within the game.
That is, you should have the choice to take whatever type of mission you like. Consider this...
There are four missions available, all 180t, all the same distance.
1) standard, low risk haulage. Biowaste (not sought after). 7m.
2) standard, moderate risk haulage. Consumer goods (somewhat sought after). 9m.
3) standard, high risk. Gold (highly sought after). 13m.
4) special event (you will get attacked, delivery is to a poi where you'll need to defend yourself and the target ship), ultra high risk (platinum). 17m.
Just example figures. But if you want to avoid combat entirely then your option is clear. As these aren't wing missions, I'd suggest the difficulty of gold standard should be SLF and decent shields difficulty. But I'd suggest running Platinum would require actual effort for defense.
And I think it's pretty trivial to find systems that require higher or lower value commodities so the player really does have full control.
At it stands now? It's random. It's relatively pointless. You literally have no choice (except don't do it).
For wing missions... The idea that people are attempting to argue these should be done solo without protection just annoys me so I won't go there right now.