head to head
X4: Foundations asks more than The Elder Scrolls V: Skyrim, and the gap is optimization.

Optimization · Pure Optimization
An open-world RPG mostly about discovering and stacking exploitable progression systems.

Optimization · Pure Optimization
Open-ended space simulation of trading, station-building and faction warfare.
The Elder Scrolls V: Skyrim 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.
The Elder Scrolls V: Skyrim
Combat is forgiving; aim and timing rarely punish you.
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.
The Elder Scrolls V: Skyrim
Enemy AI is scripted and exploitable; not adaptive.
X4: Foundations
AI factions follow mappable economic logic.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
The Elder Scrolls V: Skyrim
Loot tables and leveled lists inject mild randomness.
X4: Foundations
Simulated wars create some unpredictability.
X4: Foundations leans clearly harder on optimization.
The Elder Scrolls V: Skyrim
Skill stacking, enchant loops, and exploits are deeply solvable.
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.