Possibly, but I've actually been hunting for a cross-platform, easy-to-build UI kit for Python, and this certainly seems easier than Tk or Qt. So it fits the bill for general cross-platform use ;-)
Why do you find this this easier than PyQt/PySide?
You can use Qt Creator to design interfaces graphically, and bundle and distribute your application with PyInstaller.
This will also let you use the given platform's native interface widgets.
I've never had any issue installing PyQt (or PySide) whatsoever, though I usually use Conda [1] with the Anaconda Python distribution, rather than the system default (which you shouldn't use, IIRC) or the official one from Python.org.
The easiest way to get started is probably with the Miniconda [2] Python distribution.
I'm not sure if Conda pulls down Qt, though, or if you have to install that yourself (e.g. via Homebrew).