We've got a similar thing in New Zealand: the Consumer Guarantees Act. The people who sold the broken thing to you can either fix it, replace it, or refund you the cost of it. The decision is unfortunately up to them, so they sadly often replace things rather than fixing them. Consumer NZ is usually used as the independent source for expected product lifetimes: https://www.consumer.org.nz/articles/appliance-life-expe…
15 years seems darn short for an oven. The (electric) one I have now is from the late 1960's, and perfectly functional. At church, our (gas) kitchen oven is about a century old - and the last service man we had said that it should be good for another century, if we're careful not to let it rust out.
Who gets to decide how long something gets to last for?