Saving the page as presented in my current browser session can be vastly different vs a non-logged in guest with no changes from browser addons.
Many websites require browser addons to be tolerable. Reddit likes to hide the end of comment chains to artificially inflate their fucking click metrics, and addons are required to load those comments inline. Saving pages with ublock enabled is also a must. I think selenium can do this: https://stackoverflow.com/questions/52153398/how-can-i-add-a...
So being able to use a login token or auto login with an would be useful. It’s probably best to create a special archive only user for each website. Otherwise it’d be a nightmare trying to remove the elements such as username, favorites, subscribed, etc and make sure the redactions aren’t broken by a future site design update.