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This is a pretty fluff piece. There isn't really much explored here.It's not supposed to explore anything, be amusing, or whatever.
It's just a rant about a certain specific UI trend.
>The only interesting idea I can write out is that the author says that knowing the length/size of an article/book is intrinsically good
That's not "the only interesting idea", in the sense that there were supposed to be more but are missing, or they are there but are not interesting.
It is literally the one and only idea the author wanted to convey with this post. They didn't set out to explore some vast expanse of UI design ideas. Just to write a rant about the lack of scrollbars/indication of position.
>I do wonder if that is necessarily true.
Yes it is.
>Maybe one can argue that knowing the length of a written word has resulted in less people engaging?
That's a problem for the content creator, not for the users...