Einlanzer0
Adventurer
Yes. This, I will agree with entirely. This is an argument I have made myself, many times, in support of removing the Radiant Triangle and using Spelljammer as a standalone setting rather than a metasetting.
But "low magic" and "magitech" are not Spelljammer. They are, in many ways, the diametric opposite of Spelljammer, which was a decidedly high magic setting with decidedly pre-industrial economies and societies.
I'm not the only person telling you that this isn't Spelljammer. Do consider that if you want to sell a game on the brand appeal of the Spelljammer name, the people telling you that your work isn't what they're looking for are the people who are most likely to give your game a second look or a first chance.
I understand your point, and maybe I presented this poorly, but what I'd be looking to do would be incorporate spelljammer into a new setting in a way that doesn't discard established canon/lore around spelljammer. The CS would provide the mechanics and general SJ lore you would need to run adventures within that setting but it would also be easily adaptable to other 5e settings and would allow you to run a more traditional SJ campaign.
It would not be marketed as spelljammer, but as a new sci fi setting that would help establish spelljamming more broadly with 5e D&D.