I don't "carry" a (unlined)softshell, I WEAR it at all times in cool to cold temps. Stretchy and comfortable, breathes better than a windshirt, much more durable, and seems to dry almost instantly. The OR Ferrosi hoody is among my favorite pieces of gear ever, and I live in it from fall to spring when the temps are cool enough.
Trail hiking and intermediate temps where you might wear it, and then temporarily-not worth carrying more weight, I'd go with a windshirt.
I get offtrail pretty frequently, do a lot of scrambling, scraping on rocks, forcing my way through brush, and climbing around waterfalls. My Ferrosi is well beaten yet 100% functional after several years of use, while I'd doubtless kill a windshirt in a "good" day.
I find a lined softshell too much for hiking in temps above the teens, as I will wet it out, and it provides no meaningful insulation when stopped, so those are dead weight to me.
btw, I live in the South, and our year-round average morning humidity is 86%. At 40F with a windshirt over a light baselayer, the inside surface of my Marmot Ion windshirt will be beaded with moisture in less than 40 minutes(or sooner, just checked after 40min when testing). I can wear my Ferrosi at that temp, and stay dry all day.