I'd argue that it does not, at least from a privacy perspective. Sites that could be completely client-side but are used less than once a week now need to keep

I'd argue that it does not, at least from a privacy perspective. Sites that could be completely client-side but are used less than once a week now need to keep user data and authenticate users. Another solution to that would be to allow asking for longer storage after some engagement. My OP points should actually seriously reduce trash and enhance privacy since not every single site you visit can use your storage for 7 days, only those you actually engage with. The variability is directly tied to the importance of the users data in storage. A user clicks on a "Read later" button that would imply the 45 day rule (or 90 if he spends more time), if a user adds a file or enters text it's the 180 day rule. I have yet to encounter a site that alerts me to come back with in 7 days, they all just save the data server-side, which I don't feel is privacy friendly.