Pressurized cabin altitude and airplane altitude are SEPARATE; it doesn't matter at what altitude the airplane is, or as you incorrectly fuse these altitudes, as would be the case in a non pressurized airframe
Not fusing the altitudes GlueBall and fully aware of the differences. Are you sure that all aircraft have the benefit of manual cabin control? Aren't there a few that are auto-schedule only with cabin climb initiated automatically below a pre-set designated FL for high altitude operations (think GA rather than mainstream airlines)?
Perhaps you also meant to say that with non-pressurised cabins the cabin would descend in line with aircraft descent and there would be no cabin climb? Not sure how many brave souls out there would fly any form of passenger transport aircraft without some form of pressurisation and/or oxygen above some of the altitudes mentioned anyway! On the other hand....
