Or, just come up with another design for that area that doesn't require altering the bulkhead. Problem solved.
In that case, you would eliminate what you said is the most important thing to you:
(setbacks, size and character of public spaces, public amenities)
You'd be left with a 160ft-ish building along the riverfront... which is also apparently evil in your mind. Just find that odd.
when the current bulkhead begins to age out
That's like 50 years from now, so hopefully a developer isn't selected based on this phased in approach. The buildings may not even be there in 50 years, given the last 100 years of Jax history. The last time that bulkhead was built, was when the City Hall building was constructed... and that was torn down after roughly 60 years.
there can be adjustments made to bend portions of the project to select realities
Yeah, like from this:


to this:


Sure is getting a consistently cheaper facade than the years of pretty renderings provided in press releases as years go by.
Site plan since 2018:




People need to be less dazzled with renderings, and more realistic about how unrealistic those renderings really are.
See this:
https://www.thejaxsonmag.com/article/wait-is-lerp-not-actually-happening/A large contract awarded because the winning bidder went well above the scope of the bid.. even though most of what was proposed is likely not realistic, like creating a living shoreline to replace a just-rebuilt bulkhead. Not only was the proposal much larger than what the City could realistically afford, they ultimately won based on a public art piece, whose actual future seems pretty tenuous.