Customers almost always want to not deal with bugs, jank and slowness. It wastes time and attention, which is much worse than wasting compute.

Minor issues are usually tolerable, especially when there aren't any alternatives. That doesn't mean there's no cost.

I agree, but it’s usually not an “all else equal” situation when it comes to alternative products.

Customers would rather play a buggy/janky game like the Elder Scrolls series, Minecraft (especially early in its lifespan, not really so much anymore), or Ark (the dinosaur game) than play a polished bug-free game with boring gameplay.

Or as another example, customers would rather deal with the ugly UI and slow UI performance of Autodesk Fusion than use a more polished/native feeling application that isn’t as powerful for design work.

Games are a completely different type of application. They're not utilitarian, they aren't automatically better when they behave predictably. The launcher, the menus, the game engine are fairly traditional but the game mechanics code has completely different desirable properties.