my mother always says that everything other than a home, food, water and human interaction is a luxury. she says with that mindset you learn to appreciate everything.

but to answer what u asked for: electricity. the absolute brittleness of the electric system, especially with what is going on with dismantling public infrastructure over in the US, it's a great reminder that as normal as we see electricity, it's a luxury dependent on the duty and diligence of tens if not hundreds of thousands of workers all around the world