[the-cakeboss]

While I think that is one response to this, you seem to be diminishing the importance that extra cruft has upon the effective message conveyed. Simpler is more economic, but it also eliminates those ephemeral things communicated implicitly. A TLDR is certainly an adequate substitute for those not interested enough, but an abbreviation can never capture the full expressive thought contained in a larger, well written text.

Effective visual communication, whether it be anything from body of text to an icon, is not necessarily contingent upon its complexity.

[user-id]

This is why including a summary prefacing long-form writing is such a good idea in general.

[the-cakeboss]

I suppose, depending upon your aim.

(And by long-form, I assume you are talking about an article or something rather than a book.) If you aren't concerned with people actually reading your text then yes, thats probably a good idea. But prefacing in this manner generally tends to disuade meaningful consumption, "why read in 4 pages what was summed up in 4 sentences", a reader might think. I think prefacing could arguably contribute to effective communication, but it stifles engagement significantly.

Just my 2 cents...