Sure but I wouldn’t call
making their games as extensible as possible
hard work since it has always been like that.
It absolutely is.
If you don’t make extensibility a core philosophy every step of the way, it disappears very quickly.
Bethesda would need to completely rework their tooling and engine to block out this core philosophy.
They are reworking their tooling and engine constantly.
If they weren’t making a deliberate point of making extensibility a priority, it would disappear on its own as development that didn’t make it a focus left it behind. It doesn’t just magically happen. It’s because of good process.