Every engine can be ammended pretty heavily. Black ops 2 used an engine that came out nearly a decade before it (id tech 3, quake 3 engine 1999) .
How was a triple A game able to compete in the world of modern fps with a ten year old engine? You can change the engine.
That being said, “restrictions of the hex engine” is first of all, silly when given how much about game engines these posters know, and secondly, not even close to being a legitimate reason for a sequel.
Hell, they will probably still use the hex engine in the sequel, and just modify it based on their gameplay designs.
Can we drop the “limitations of the hex engine” thing? If you’re thinking they haven’t done it before, (crossed these limitations) first of all they have, and second of all ig has had a rigorous deadlines intensive last couple years, but with the characters all back, they can take time and really develop the future of ki, via an unbridled and unrestrained season 4 hex engine