As noted in the OP, “use by” and “best before” (etc.) dates are vastly different from each other. “Best before” is very often ad hoc like “a year from the date of manufacture”, but if you’re past a “use by” date on your perishable food, you should approach it skeptically.
Climate Town has a good video on it and why this system exists as it does.







I mean, yeah. Even X11’s own maintainers are sick of that mountain of spaghetti and are just keeping it on life support. Anything trying to replace X11 (besides XWayland) is effectively a throwaway project and shouldn’t be seriously used.