by the form we can say that the roof has not received the proper attention for a long time. It does not look awful or great - it looks like something incomplete. I personally happened to see in life such a phenomenon of Permaculture as moss planted on the roof. It looks rather beautiful and unusual. Has thus two functions (as you also have described) aesthetic and heat preservation.
I also hope that in the minds of people there will be great changes and change the nature around oneself - it will become a worthy and "fashionable" affair.
One way or another, the development of high technology is contributing to this already today.
Have a nice day