I bought an HTC Evo when they first came out. I love the phone, but Sprint charges an extra $10 for 4G for the phone, even though it isn't available here. The plan was that it would be available here within 12 months, and in the mean time I had to pay for it because I could go to places where 4G works - I got to use it in an airport once for about 20 minutes.

If I write some custom code and you sign off that I've delivered what you have asked for, that is on you. And if I wrote any packaged software, I'd have to put in my EULA that by using my software longer than means you have tested it and certify that it is suitable for your purposes for which you intend to use it. Additionally, you would have to agree that any change in the environment in which my software is installed invalidates any warranty or guarantee. This would include changing hardware beyond a simple unit swap, modifying or updating drivers in any way, or installing other software that could potentially use the same resources (such as memory) that my code is using. OS patches and upgrades would clearly be completely indemnifying. Welcome to software as an appliance.