The difference is that in one case the credits on lockbox missions are fabricated when you open the lockbox. In the other case, the credits are coming from another player. To the person running the missions, credits are credits, but to the economy as a whole they are different things. I don't pretend to be wise enough to predict the consequences of the difference, but I can see that it is there. As an anaolgy, running slicing missions for a constant profit is akin to sending workers out to print money, while gathering is akin to owning a lumberyard, sending your workers to go chop wood, and then later selling the wood to other people. Probably a terrible analogy but it's just the gist of how I think about it.
Are people taking issue with the slicing mission nerf running a craft skill? If so, why take slicing when clearly craft skills require two gather/mission skills to make good stuff. You can also level your craft skill without making blues or purples with just a gathering skill, and take slicing for the nodes and extra money early. I do this, and don't have to bother with crafting much while I'm doing story and leveling/exploring the world right now.
I guess I'm just curious what category of players wanted to send all of their companions out on slicing constantly, that just inherently seems silly. If I'm trying to craft good stuff, I send my people out on mission skills, or crafting if I have some good mats. If I'm trying to level crafting, I make sure to gather nodes while I'm out and craft stuff. If I'm trying to level my gathering skill, I send my people on gathering missions for what I assume (possibly incorrectly) should be a net loss on materials I can find myself.
I suppose if I just wanted tons of money for no apparent goal I would run slicing, a gathering profession, and a mission profession. Use the slicing nodes to fund the missions for rare stuff to sell, and use my secondary gathering profession nodes to sell mats for profits. This actually sounds like a good way to gather all the mats for a crafting skill and then swap slicing for the craft later.
I'm still pretty low level and I'm trying to wrap my head around the crew skills world, but all of my potential goals seem inherently achievable with the system, what specific issue do people have with slicing as is? If it's not good enough, don't take it and make money some other way. I find it useful for my play style.
There has to be other people who are finding slicing convenient and useful like me who aren't posting because they don't care and things are working out great.