head to head
X4: Foundations asks more than Minecraft: Java Edition, and the gap is optimization.

Optimization · Pure Optimization
An open sandbox where mastering crafting and building systems dominates over any physical skill.

Optimization · Pure Optimization
Open-ended space simulation of trading, station-building and faction warfare.
Minecraft: Java Edition leans Optimization (Pure Optimization); X4: Foundations leans Optimization (Pure Optimization).
X4: Foundations leans a little harder on execution, though the gap is small.
Minecraft: Java Edition
barely relevant, building/PvP negligible for most
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.
Minecraft: Java Edition
no adaptive opponent, sandbox play
X4: Foundations
AI factions follow mappable economic logic.
Minecraft: Java Edition leans a little harder on variance, though the gap is small.
Minecraft: Java Edition
world gen and mob spawns randomized
X4: Foundations
Simulated wars create some unpredictability.
X4: Foundations leans clearly harder on optimization.
Minecraft: Java Edition
redstone, base/resource routing solvable systems
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.