I'd guess it's more likely that there used to be a "Printers" control panel, when the main thing it controlled was the DB-25 parallel printer port on an ancient

I'd guess it's more likely that there used to be a "Printers" control panel, when the main thing it controlled was the DB-25 parallel printer port on an ancient IBM-compatible PC, and later they added other devices to it. People accustomed to adjusting printer settings might scroll straight to "Printers" and be confused if it got renamed to "Devices." Even more nefariously, it's reasonable that there's some software out there that does a string comparison for "Printers" that ignores extra characters like " and Devices" which would be a reason not to rename it completely. Similarly here, cookies have been around since Netscape in 1994. IndexedDB is as new as 2015, window.LocalStorage is from ~2010 IIRC. For backwards compatibility, it's totally reasonable to use "Cookies" or "Cookies and local storage", and expect that to extend to any new developments.