It’s true that devices can go bad but the device itself isn’t that important. So long as you have your seed words backed up perhaps in two locations. If you use cold card you can do an encrypted file backup that can be loaded on a different cold card later. Also if you’re not intending to spend but primarily to save to long term cold storage you don’t even necessarily need to keep your seed loaded on any device at all since you can export a list of addresses or use a watch only wallet to generate receive wallets without using a device loaded with the private key at all.