Let me rephrase.
I can see several separate concerns:
- page load time / viewer bandwidth
- server-side storage
- server load / performance
- upload speed
- image quality
- case one: diagrams, line drawings, etc., where JPEG compression is ugly and inefficient
- (theoretical) case two: a photography forum where other concerns are not as important as preserving the image
… and I am unclear on how exactly the available settings impact these, especially with that new feature.