I wonder how large a website using this scheme can practically be to work on most browsers. I know of at least one browser that limited URLs to 100 characters, but it's almost 30 years old…
The HN frontpage bitty that I posted in another comment is around 8K. [1]
I also did a reddit one that works on my browsers[2] (copy/paste URL into new tab) at 26K (!). Which is apparently too much for HN. (Where's my free 5GB of storage for signing up?!)