I think this is just lack of knowledge, I have answered about the includes paths in your other post from a short time ago.https://www.visualmicro.com/forums/YaBB.pl?num=1348059336

Platform IO takes people into undocumented properiety territory and we want users to be able to build the code using Visual Micro or the Arduino IDE, to keep users in the community so that they can benefit from the support the entire community has to offer.

note:

To include headers is okay but that will not give you compilation of c++ or c files that are found in the includes. However, you can also use shared projects or shared library projects. These allow for an unlimited amount of code in any folder(s) but will all conform to the arduino standard. That way all the code can be shared with the Arduino community and more easily supported in the many different forums for Arduino.