I wasn't saying that old smartphones were in any way comparable to modern ones. My point was that smartphone development has been occurring far longer than most people realize, and is in-parallel with PCs in that the performance characteristics of the device have outpaced the capabilities of the software and user experience to the point that there's not a whole lot of benefit in upgrading without an external reason to do so.
And as to your analogy of GPS vs maps, I can use a map without any electrical power, and I can identify on the map, if it's a good one, which roads my low-ground-clearance car can traverse, versus which roads my 2wd small pickup can traverse, versus which "roads" I'll need a 4x4 or truck with significant ground clearance to use. Most of the time the latter aren't even noted on GPS systems.