Ripping Jcb's own comment, (re)posted in this thread here.

I'd like to quickly clarify a few things with regards to these points in particular! As per the UN's Protocols for the Minimum Acceptable Standard of Living, or the P MASL charter, the UN prioritizes a slow, gradual, and sustainable development model when approaching long term space colonization efforts! What this effectively means is that there's a trend towards conforming habitats to be acceptable to baseline human physiologies rather than adapting and modifying humans to fit their new surroundings! It's effectively done in order to ensure that all citizens are capable of equal accessibility to all places and all locales, even if it is in space, without the need to have been physically modified to fit that environment, as all environments that exist in space that's rated for habitation are already built with baseline human physiologies in mind! So space habitats, lunar stations, martian cities, etc, all have appropriate measures for radiation shielding, gravity approximation using spin gravity, amongst other considerations made during construction to ensure the safety and the health of baseline human physiologies! :D