I guess it very much depends on where and how you travel, and what you are used to.

In the USA, I used to use paper maps extensively, especially the De Lorme atlases.

Where I am now (and the same applies to much of the 3rd world), the only easily available paper maps have very little detail, and are useless for anything other than following the highways outside of urban areas. They can be used to plan broad details of a multi-day trip, but are useless for anything else.

I could get the government topographic maps, but that demands a trip of a few days and a significant cash outlay. The downside to those maps is that they are bulky, fragile and way out of date.
That wouldn't be an issue in the 1st world, but taking the wrong route here could mean riding some rocky, broken trail into the night, and possibly getting into insurgent-controlled areas.
At least the OSM, Google and Garmin-compatible contributor electronic maps I use are occasionally updated. Carrying both the phone and the GPS also gives me options when the different maps don't agree with each other.

Mostly I travel by motorcycle, followed by bicycle and then public transportation (bus / banca / ferry). On the bikes, I don't think the phones are robust enough to withstand the conditions (very rough roads, rain, dust, very hot sun), as compared to a top end GPS like the Garmin Montana or Oregon. So, I usually store them in a tank or saddlebag and pull them out when needed.

Just a different take on things.

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