You could also make this argument in the other direction: it's incredibly shortsighted to lock yourself into Qt when there are some things you can do only with

You could also make this argument in the other direction: it's incredibly shortsighted to lock yourself into Qt when there are some things you can do only with a native toolkit. Using native libraries on each platform gives you flexibility and intra-platform consistency at the expense of lots of extra effort. It really just comes down to whether you're willing to expend this effort or not.