Here I am using an iPhone app like I have been for a decade, feeling safer than ever. I'm really glad I didn't jump on the hardware wallet trend.
Even iPhone apps:
https://www.reddit.com/r/Bitcoin/comments/1x46gnh/a_fake_cry...
Not sure if your comment invalidates the context: your iPhone app (or hardware or iOS, etc) could have a bug that was not discovered yet. It's all about attack vectors, and opponent motivation and resources.
It always depends how much money you got in the wallet. People in the crypto space go super paranoid, 2-of-3 signing schemes with top-notch security, hardware legers, metal-plated keys that are burried in the woods etc, and in the end they hold less than 1000$ in the wallet... All safety measures should be chosen relative to the amount you are actually securing.