I can give you a counter-example where it does have an affect – the value for the upload speed is transported to the code via a define and can then change behavior for different values. Like e.g. in How could the main.cpp read the parameters at platformio.ini? - #3 by maxgerhardt. Instead of doing extensive and complicated research on which option exactly can influence which part of the buildprocess, the solution of rebuild on configuration change is actually quite good for correctness.
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