Many PDF viewers and library do not fully follow the PDF standard or have subtle bugs. This leads to problems later on.
My guess is this all started many years ago when Adobe Reader was the standard PDF reader and it was (and still is) very lenient when it comes to PDFs that aren't exactly following the specification.
So what did everyone else? They followed Adobe's lead because "But, but, ... it works in Adobe Reader!"
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Many PDF viewers and library do not fully follow the PDF standard or have subtle bugs. This leads to problems later on.
My guess is this all started many years ago when Adobe Reader was the standard PDF reader and it was (and still is) very lenient when it comes to PDFs that aren't exactly following the specification.
So what did everyone else? They followed Adobe's lead because "But, but, ... it works in Adobe Reader!"