I can't speak for the others, but here's my perspective:
1, I'm still willing to help script what you need done
2, our ideal worlds are very, very different. That's fine, I don't have to like what you like in order to help. But even how we envision a low magic world is very, very different. Again, that's fine, I don't have to share your vision to help. But how we perceive RP is also very, very different. To repeat myself a third time, that's fine, don't have to agree to help. But it does mean that I'm pretty useless outside of just scripting the stuff you need done.
To give a concrete example, consider the Flame Arrow versus Fireball example. I mentioned my general idea that I thought Flame Arrow should be better against 1-2 targets and Fireball better against 3+. You seemed to like the general idea. But then you thought Flame Arrow did way too much damage when I showed what it would have to do in order to make those statements true and wanted to bring it down to the point where Fireball was better against two targets.
And then Cannonade still objected even to that lowered damage. Which brings us to...
3, I'm tired of arguing with Cannonade and Mystery Clock. If you want me to balance spells for a low magic world, I could do that. If you and I agree on how spells should work and want me to convince those two of our position, I could do that. If those two and I agree on how spells should work and we needed to convince you or our position, I could do that. But it felt like you three had much more of a common vision for how you wanted things to work. My principle is Gameplay > Story. If something's bad gameplay, it doesn't matter if it makes sense story-wise, it should be changed. You three seem to be Story > Gameplay where you want things to make as much "sense" as possible even if it's bad gameplay. I put "sense" in quotes because of the whole suspension of disbelief for everything from miraculous healing to surviving a fireball to the face. And I'm still willing to help you...but at that point I don't have anything to offer beyond technical skills.
4, I wrote the resting scripts you wanted. I was waiting on the details for the oxygen system you wanted. I was waiting for the details on what you wanted added to SimTools or whatever. I gave up on the spells and was waiting to hear what you wanted done with them.
So I'm sorry to hear you're potentially giving up on the project. I'm still willing to help script what you need scripted, but otherwise it's clear our view of how things should work (even within the context of "low magic RP focused world") is extremely different so I don't really have anything to offer beyond scripting. And if you need more than just a scripter then that's outside my purview.