Hiking in the Uintas where there are lots of rocky passes, trail runners would suck in those situations.
I was very thankful for my sturdy hiking boots crossing Anderson Pass last August!
I went over Anderson pass last summer in La Sportiva Raptors. To each their own!
That's the problem so many people following 'gurus' or how to articles. They are professing or writing what works for them, everyone's style and use is different.......... research, research from many sources to get what works for you as the individual......
BINGO. Shoes, more-so than any other other topic in the hiking world, are incredibly personal because each person's feet are unique, not to mention their packweights, preferences, etc. I'd never recommend a specific model of footwear to someone else, because the shoe might work great for my feet, but might be absolute misery for them. That being said...
I have ankle problems - chronic probably, from having walked 1800 miles in 3.5 months on a bum ankle. Smart, right? I did this in mid-hikers, basically hiking high-tops. Not full-on boots, but certainly on the mid-heavy end of the spectrum. After the thru-hike, as part of my larger re-evaluation of gear and hiking style, I ditched those heavier shoes for lighter, more nimble trail runners. They were still substantial enough (11.5-12 ounces each, depending on how much mud was caked on when I weighed them!) to handle spicy terrain, but nimble enough where I can really control my foot placement and plant squarely. Immediately my ankle problems disappeared (or rather, receded enough to allow me to continue hiking).
This weekend I tested out a new, even lighter pair of trail runners, the La Sportiva Helios (9 oz each). They may not be great for the rocks of PA or the Winds, but walking on sand, slickrock, and through wash bottoms they're superb. My legs don't get as tired at the end of a long day because they don't have to haul as much shoe around. Anyhoo, in general, I'd recommend to people the lightest shoe that they can comfortably hike in. That's different for everyone of course, but who wants to haul around extra shoe?