Nah, you can zoom in or out. Glance at the zoomed out map and then zoom into the area you want to see details. No different than Google maps just with more info. It just depends on how comfortable you are with smartphones.
To some extent it depends on the map. I agree if it is just a map, like a state map where pretty much everything is just on the map.
With an AC map there is a lot of other stuff and I think that a lot of what I do with them would be awkward with a scan on my phone, at least in the format that they are currently in. I find that I often look at a map section and then flip around to find the text narrative for the same panel, or maybe the list of available services. I find myself wanting to flip back and forth between these three locations for each map section. I also often want to flip around in the various panels and look for resources in upcoming panels. It is a lot of flipping even with paper. These things are all in different places on the AC maps and just a straight scan would be awkward to me. I guess it would be possible to cut and paste the file so the map sections had the relevant resources next to them.
That said most of my navigation can be managed with only either the narrative or the map panels, so I could probably suffer along with a scan with some inconvenience. Right now the inconvenience is still enough that I carry paper when using AC maps. I have used electronic only when on another tour and a backpacking trips and it worked out OK. For the backpacking trip I carry a paper map anyway even though I didn't use it because I didn't want to be that battery dependent.
I suspect that at some point AC will make the maps more tailored to a screen, it would certainly be possible, but I don't think we are at that point yet since the majority of their customers still probably prefer paper.
Also, it is nice to still have a usable map even when your phone batteries are dead.