i see the complaints around URL length limits and i raise you..

storing the entire state in the hash component of the URL

http://example.com/foo#abc

since this is entirely client-side, you can pretty much bypass all of the limits.

one place i've seen this used is the azure portal.. (payload | gzip | b64) take of that what you will.

Except you hit limits when trying to share that URL. Eg: try pasting a URL longer than 4096 bytes in Signal or WhatsApp, and they don't render it as clickable.