You never set a time frame. So here’s a far distant future vision.
Ideal? I think far, far greater scale.
Imagine a world where technology and science has reached its absolute zenith, where things we view as impossible miracles are a reality. Entire worlds appearing from nothingness, wholly formed and terraformed to perfection, in the blink of an eye, on a whim. The power to rearrange the stars of the sky like sand on the shores of an infinite sea.
Absolute immortality for all who desire it, unaging, with the ability to appear and become anything you desire - male or female, anthropomorphic or otherwise. Dysmorphia, sickness, hunger, disease, all forgotten concepts of a distant past.
The very fabric of space and time bends, and any child can travel at whim to the heart of a star without harm, walk effortlessly upon the surface of a neutron star, explore the vastness of distant galaxies with a single step.
Those with conflicting philosophies can craft their own worlds, experimenting with what they believe things should be like, and compare their findings.
A pipe dream utopia? The science is there in theory, though separated from us by countless eons of time. Sufficiently advanced technology is indistinguishable from magic, as Arthur C Clarke once said. Utility fog, ship of theseus style immortality and more await, if we can come together as one.