> It also encourages memoryholing old websites which aren't maintained - priceless knowledge is often lost because websites go down because no one is maintaining them. On my hard drive, I have a fair amount of stuff which I'm reasonably confident doesn't exist anywhere on the Internet anymore.... if my drives fail, that knowledge will be lost forever.

If the website really isn't maintained, then it's only a matter of time until the server is part of a botnet. Setting up LE for a simple site takes half an hour once.