I live in Southern California, and though it was "originally" (and now returning to with the drought) a desert, it really is pretty stable in regards to temp around here.
That being said, I still use shade cloths for mature plants. I have a shade hoop house and a 4x4 ft floating shade block to help ease the noon direct sun. The shaded hoop house shades the plants all day long.
All plants under the shade have performed remarkably. They grow with little stress and can become big lush plants. The only one that I have had any problems with was a De Arbol that stretched like a mother. Everything else I feel does as well or even better than the uncovered plants I have.
I know it is counter-intuitive but that's how I have witnessed it. Anything in direct sun all day long seems to struggle and anything under the shade cloth does wonderfully.
The stuff under the shade is a little more spaced out, but there is great air flow and when I say spaced out, I mean just a little-bit, but very healthy.
OH, HUGE BENEFIT - the shaded hoop house slows gusts of wind down almost 90% and two sides are wide open. I watch plants and pots alike tumbling across my back yard, but in the shaded hoop house, they just flutter a little bit when a big gust comes along!