I love juxtaposition. I think your sci-fi world will be so much more interesting because of the juxtaposition of the old and the new.
I would add a library and lots of books to your areas that are meant to be retro. Books are quickly becoming antiques. In my area, all the bookstores that sell new books are gone. All we have left are used bookstores stocking books that are less and less current each year. The last time I went the used bookstore, I cried. Used was not old a few years ago. Now all used books are old books.
If you are using CC, there are mods for a newspaper box and a magazine rack.
I guess in contrast, your modern libraries would be all computers with maybe a single room with rare artifacts for any books, and a restricted door that only let certain people into it.
In Bermuda, there were no cars until WW2. The US Army built a base there and forced Bermuda to allow cars onto the island if they wanted the protection afforded by the base. Before that there were only trolley cars and horses. Not because the island was poor! There was a strict ban on a technology that the island did not want there.
The Amish and Mennonites continue to ban certain types of technology while embracing others. They love plastic and they prefer synthetic fabrics to natural fabrics. Will you have religions?
With advancement, there are always people left behind. Where will those people live? and in what conditions? What is the history between now and your future? Was there war? Plague? Or has man gotten kinder and smarter and more benevolent? What percentage of people were left behind? Are income levels fairly equal, or is there a very small elite class? Do the elite restrict access to technology for the masses? Or is there some other barrier than prevents some people from having access to certain technologies?