I went to Grenada in 2014 and used offline maps to drive around the island. In 2015 the tablet suffered an accident and I powered it off to deal with it later. 5 years later I power it back on without internet connectivity. Turns out the maps expired. So much for many years
While I agree this is potentially an issue, most people with most devices won't be away from the internet for years. If you want it to be apocalypse proof for when the internet goes down you should probably get a paper map.
That is the antithesis of many years and why google maps is not sufficient. You know what’s still around many years later? My paper printouts from Mapquest
I went to Grenada in 2014 and used offline maps to drive around the island. In 2015 the tablet suffered an accident and I powered it off to deal with it later. 5 years later I power it back on without internet connectivity. Turns out the maps expired. So much for many years