K’ta’Viir of ancient Shadow World infused technology with magic but they didn’t last forever.
There are, of course, always reasons why great civilizations fall. The above examples require relatively high-level, well-educated adepts (essence alchemists) with plenty of free time to enchant such marvels. The empire's enemies (from within or without) might just hunt them all down and burn the books of their lore, or the system they built might just break temporarily due to external shock, and fail to keep the alchemists alive in the trouble that follows, which in turn causes greater trouble, and so on.
Or the civilization might just grow decadent and reliant on enchantments that no one bothers to even learn how to renew, until they inevitably break.
Or mago-ecological catastrophe might follow, when too much magical energy of the world is consumed by a vast number of such magic items. The energy might be needed for spirits or even gods to exist, and if it is used up without having time to replenish (if it replenishes at all), that might even threaten and thus anger the gods, or spirits. (Glorantha's god learners are the famous RPG example here, I think).
When there are great wonders, there is great opportunity for conflict. For story.