I've never had any issue with any brakes I've ever adjusted by "cold setting." This includes vintage steel and alloy brakes as well as more modern brakes that weren't modern enough to have a built in toe-adjusting mechanism.

The amount of bending required to change a degree or two is NOTHING compared to the amount of bending and torment these flimsy things see in their lifetime. If an alloy brake caliper can't take a tiny bit of twisting to adjust toe-in of the brake pads then they are just not going to survive the types of stresses the brake is going to see on a daily basis.

I call malarky on this fear of bending calipers to achieve proper alignment. Brakes are cheap anyhow. If they eventually fail then just replace them. It's not like we are running down the back straight at 140MPH and late-braking into the apex of turn 1 and scrubbing 80MPH in a second and a half.

I'd never trust any cheesy bicycle brake so much that if it were to fail I'd be in that much danger. Any brake can fail at any time and the typical bicycle brake is so cheesy that to ride in such a way as to necessitate 100% failure-proof braking components seems the ultimate in foolhardiness to me.

Unless I had some highly-prized collectible & valuable brake caliper I wouldn't hesitate to tweak it a degree or two. But that's just me and my $.02 -this isn't rocket science.