I think BF would benefit from going into the future proper. Gadgets that fix/improve gameplay because they're not limited by realism are fun. bf6 just feels like a slightly altered version of bf4, but no boats/water/maps. The maps in bf6 are also terrible, Empire state feels like every window has an enemy soldier camping in it
Would much rather "advanced scifi tech" be cool shit like shields, invisibility, teleporting, plasma, walkers, jet packs