Right now I have possession of several Rand McNally atlases, including the 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, and 2022 editions (but not 2021 as I never stepped foot in a store for a year after the pandemic started, although I probably could have bought one online). I also have a 1940 Rand McNally atlas and 1970-era pocket atlas, both of which I acquired from eBay in 2014. I plan to keep all of these atlases for a long while, although if I continue my pattern of buying each new edition each year it'll pile up--but I'm no stranger to to that sort of thing so it should be no problem.
Decades down the road these will definitely be valuable historical documents that reveal information about how the highway system looked in a specific year. I think there's incredible value in keeping these things around, although there may be certain situations where the costs outweigh the benefits in doing so. But for the foreseeable future I shall continue accumulating each year's atlas, and you can see little minor changes in year to year that are neat to observe (new roads such as US 301 TOLL in Delaware, new road expansions such as the progress on the outer (outer) Houston beltway, etc.).
Unfortunately, the original (2007-2009?) Rand McNally atlas (and subsequent atlas from 2010 from a different brand) that jumpstarted my interest and widespread knowledge in maps have been laid to rest long ago. I had truly wore them out to their very death; tons of pages were missing, the rest were ruined due to anything from water damage to rips to everything else, as I would literally take it everywhere I went.
But their memory remains, and their impact on me is permanent, so I am grateful for that.