So, Grandma's appliance to replace her computer. Got it. In fairness, throw a decent VNC client on there, hook up a keyboard and mouse, stop being annoyed by a little latency, and it may be a reasonable enough, though overpriced, thin client, allowing for you to actually get some work done, provided you've got a remote system or systems to be doing the real work on. Which I guess is what you just said, except that a web app is to remote access what driving a bumper car is to driving cars.
I think the disconnect some have here, Jack, is that if you have 8 computers, having one of them be an iPad that smoothly does its limited set of things with good battery life and zero time needed to be spent on configuration to do it isn't so bad. If you have one, or two systems, you're not going to have one of them be something that actively tries to prevent you from doing half of the things you have in mind at every turn, and treats like like a foreign threat to your own hardware to be protected against.