Why? Nobody expects any product to last for ever. You might as well expect Apple to give you a new iPad when your current one wears out.It is unreasonable to not include a power brick or zero cost means of getting one and then to not offer free replacements when an old one wears out
5 years is an extreme case and, yes, you'd need evidence of an inherent fault. I don't know what you do to your power adapters, but wearing out in less than 5 years hasn't been an issue since most decent power supplies switched from captive cables (which usually got frayed) to USB sockets. ...and if a charger fails a PAT test within a few years without having been abused that's pretty serious and worth pursuing (and not touching that brand with a bargepole). I had one power brick fail recently - but that was within the initial no-quibble guarantee period. Like most electrical stuff, they follow the "bathtub curve" and either die quickly or go on for years until they die of old age (that's why paying for 'extended warranties' is such a scam - you're insuring the device for the period where it is least likely to fail).The 5 years thing doesn’t work in practice, the cost of a successful claim forces you to just buy a new one and some retailers are a nightmare even when you are still in warranty.
I disagree - chargers with captive cables were a big part of the problem. It is cables that bear the brunt of the wear. In the bad old days it was usually the cable - not the charger - that broke/got frayed (and got fixed with tape, risking shorts and possibly fires) and switching to sockets at both ends was a huge improvement.The USB C connector itself was as far as this should have gone - pre-smartphones, every charger was different, so that was a good idea. Swapping to USB C on the wall end now means adapters needing to be bought
Apple have been using USB-A at the wall end back in the early days of the iPod, and that's been great. The switch to USB-C was necessary because USB-C supports the higher voltages and currents needed to charge modern devices. The fact that even Macs now use USB-C to USB-C or MagSafe cables - the captive MagSafe cables in old-style bricks were particularly prone to fraying and that was potentially dangerous when a bit of gaffer tape could "save" you £70 for a new brick.