When trying to generate examples directly from the PIP/.h files, they default to C++14, but the current develop branch requires C++17. The PIP C++ version problem seems to relate to the issue mentioned here, but maybe just a quick note in the README in the examples section where it currently says:
If you want to build the Projucer app from JUCE you can load each of the PIP examples directly to generate the IDE files.
…that also mentions to set the C++ version to C++17 or higher could go along way in preventing newcomers from hitting initial compile roadblocks. Right now opening a PIP, exporting to IDE and trying to build fails without further intervention and it may not be obvious the default C++14 project setting is too low.