Engine wear is significantly increased on repeated short trips, but that will only become apparent when you get very high mileage. Skyactivs warm up quickly, and the blue light is on when coolant temps are below 50c(120f). Operating temp in a skyactiv is 90c(190f). So, even though the light is off, your car still hasn't reached operating temp. Carbon buildup will be your biggest enemy. Skyactivs do suffer from it, but not nearly as bad as German cars like VW, Audi, and BMW. Getting rid of the buildup is easy, take it for at least, a 1 hour highway drive(at least 60mph) and just set cruise. Cylinder temps get super hot and the carbon literally burns away. At first I never believed in this and thought it was dumb, but then I saw it for myself. My friend bought a 2008 Passat 2.0L Turbo(one of the most carbon buildup prone engines ever made) brand new. He drove about the same as you, but in Calgary, we get very cold temps, and his temp gauge never even budged off the bottom, even in the summer. I think the only time it ever reached operating temp was on the test drive before he bought it! Anyways, 5 years down the road and 25,000 miles later, he had a CEL, very poor gas mileage, bad performance, and it misfired when cold. He took it to VW and they wanted to replace the timing belt(at 25,000 miles!!) and do a carbon cleaning, all told, it would've cost him $1,700. He reached out to a German auto specialist and he was told to drive to Canmore(about 1 1/2 away on the highway) and back. He did so and his problems went all away. Gas mileage remained where it was at before, performance, etc. He now does Canmore trips once a month and his car has never ran better.
Just thought I'd share this with you. Don't ever hesitate to take it for a long drive, your car will thank you!