I think anyone who has tried to teach or explain something will see why this happens. You have to make some assumptions about what readers know/can figure out o

I think anyone who has tried to teach or explain something will see why this happens. You have to make some assumptions about what readers know/can figure out otherwise you would literally be explaining everything starting from binary numbers every time. The "clearly" stuff is just shorthand for "I assume you know this because its foundational to understanding the thing were talking about now / or I'm too lazy to explain this now / or this is so far off-topic that this isnt the place / etc. etc" . Nothing more - it can be read as arrogance on the authors part but I think thats an uncharitable interpretation.