> I couldn't imagine trying to build a complex route on a tiny screen with a crappy phone UI.

I nearly always plan routes on my phone. After all, it's the device I use for navigation attached to the stem of my bike.

> Why in the hell wouldn't you prefer to use a nice monitor with a mouse for a complex task like this?

The task isn't very complex with a decent UI. See for example the open-source app OSMAnd (Android & iPhone). Also, I am rarely at my desk, but I always have my phone on me. There can also be the issue of "Neat, I made a route on a big screen; now, how do I get it on my phone for real-time navigation?" depending on the app you are using.

Because you might plan a route while already out on your bike

Obviously not a representative sample, but I'd say ~25% of the people I know have a monitor and mouse, and the majority of that group only use it for work.

Thia isn't to say you're wrong. I much prefer my monitor and mouse for anything of reasonable complexity. But I increasingly find myself in the minority in that regard among people I know. Hell, I even find myself in the minority for using a laptop for tasks sometimes.

I mean, i made the remark and I feel the same as you. I think its just the reality of the world we live in. A lot of people are mobile first, watching a neighbours kid try use a mouse the other day really drilled it home for me. Put her on a phone? No issues. But on the laptop the kid was as lost as I was when my dad showed me a slide rule (i'm 38).