I also do not "need" a smartphone, any more than I need toy trains. I avoided them as long as I could until I could no longer deny their usefulness. Like Balshis's wife, I'm an avid hiker, and also lead hikes all over my state for the park system I work for. Many of the trail systems we visit have poorly marked trails and no maps in some cases. If we get turned around I can pull up a map app on my phone and can quickly find my location. Drivers can do the same thing on roadways. I am not fond of the turn-by-turn directions phones and GPS units use, however, preferring instead to bring up the map, see when I am and use that map similar to how I'd use a paper one, with the advantage of seeing exactly where I am on the map.
The point going off on this apparent tangent is that we all use some degree of modern technology to better enjoy our trains. Many of those poo pooing smartphones have made the switch from conventional to "smart" control of their layouts. They are even communicating their feelings on the topic on an online forum. What technology you use is a personal choice but it should be in informed choice, not based on disdain for new things, or the stupid or rude things things some do with that technology (phones). I own TMCC equipped engines, saw what they could do, but went back to conventional control. My choice, but I didn't make the choice the way my late father stubbornly refused to buy any car with an automatic transmission, because they were "new and unnecessary" (even though they'd been around for almost 50 years when he last drove )