head to head
X4: Foundations asks more than No Man's Sky, and the gap is optimization.

Optimization · Pure Optimization
Procedural space exploration sandbox with crafting depth.

Optimization · Pure Optimization
Open-ended space simulation of trading, station-building and faction warfare.
No Man's Sky leans Optimization (Pure Optimization); X4: Foundations leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
No Man's Sky
Light shooter and flight inputs
X4: Foundations
Flying your own ship matters early, fleets later.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
No Man's Sky
Mostly solo, sparse PvP
X4: Foundations
AI factions follow mappable economic logic.
No Man's Sky leans a little harder on variance, though the gap is small.
No Man's Sky
Procedural planets and loot
X4: Foundations
Simulated wars create some unpredictability.
X4: Foundations leans clearly harder on optimization.
No Man's Sky
Base, freighter, expedition progression
X4: Foundations
Station logistics and empire economics are a pure engine problem.
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.