I didn't really play much skywars until the previous update was brought to life, but I do remember the Modern map. Modern was pretty unique in terms of playing style, and I actually liked it as a map.
It had a few issues here and there regarding the large distances between islands & the unbalanced amount of chests at the middle, but I think that this map could be remade with a somewhat closer distance between islands & some semi-mid islands. TNT boosting was something I always wanted to try on that map, but I discovered the technique a little too late so I couldn't ever try it.
Lots of the removed maps in SW weren't really my favorite, but Modern was a pretty fun one.
Oh and before I forget: DNA was a really fun map and I'd love to see it make a comeback with the same layout it had before the update. Me and
@Lezappen loved it for its small islands & chaotic gameplay.