In France it's a requirement to carry a set of replacement bulbs in your vehicle. I'd guess that the idea is that as soon as it's noticed that one of your bulbs has gone, you can replace it? ? in the supermarket car park or on the roadside. Seems like a good idea.
Until I came to replace a brake light on my Megane Scenic the other day. Rear light cluster is held in by a couple of T20 Torx screws. Now as it happens I had such a tool, but only by accident! I'm sure not many people would have one, so should the manufacturer be supplying such tools as a safety feature?
John