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I've not seen any failures with integrated. A lot of people used to buy a spare and store it in case but I ended up with a few on the shelf and never any call to use them. They also cost less than the GU10+frame equivalent, especially if you need higher IP ratings or fire resistance.
Having said that the first integrated I installed were maybe 6/7 years ago so not an entire expected lifespan.
You would probably find something so similar in the future to replace a failed one, why worry?
Why do people like integrated? Seems silly to have to pull the entire fitting if the bulb goes (which it will -despite what they say about fifteen zillion year lifespans, the bulb will go before you are ready to replace it).