A previous dev has recommended the GTA six map should be smaller sized and even more densely packed. Having said that, as leaks have continued to trickle out of Rockstar, modders have recreated the GTA 6 map in GTA 5's engine which gives a way of its large scale. https://gtasixfiguretemps19640.targetblogs.com/35854053/not-known-factual-statements-about-grand-theft-auto-6-pc