Interesting. But I think the vast majority of this functionality is already available in the Qt framework, which I use for pretty much all my projects.
Of course Sane C++ Libraries targets a much much smaller functionality subset than Qt (that is a good library in many ways) and of course it has orders of magnitude less complexity.
You can use Sane C++ Libraries adding a single file to your project for example.
Also, Qt used to have an LGPL + Commercial licensing scheme (not sure how this has recently evolved), while this project just MIT.