So PSD is undeniably an incoherent piece of legacy crap. What's so wrong with that that Adobe/Adobeans feel they have to explain themselves - do they feel asham

So PSD is undeniably an incoherent piece of legacy crap. What's so wrong with that that Adobe/Adobeans feel they have to explain themselves - do they feel ashamed somehow? All that is needed is to just accept that it's far from perfect. It doesn't mean it's wrong or they're stupid or whatever. Many old formats are crap; heck, you might even expect any old format to be crap in a way or another! You can only write a clear, consistent format specification after the fact when you know everything the format needs to capture. Even if the basic structure is simple, such as in XML or AVI/RIFF, developers only proceed to write hacky extensions in terms of that very basic structure. The complexity just arises on a higher level, then.