A book is summarizable degree n when the 2nd, 3rd,..., up the nth reading reveal things you did not get at the first reading. (A book is summarizabl… - Nassim Nicholas Taleb

The problem is architects building structures to impress other architects --but plumbers don't act on impressing other plumbers. Any activity where agents impress peers (architects, academia) rather than satisfying the needs constituents ends up rotting.

For more than a millennium the eastern Mediterranean seaboard called Syria Libanensis, or Mount Lebanon, had been able to accommodate at least a dozen different sects, ethnicities, and beliefs — it worked like magic. The place resembled major cities of the eastern Mediterranean (called the Levant) more than it did the other parts in the interior of the Near East (it was easier to move by ship than by land through the mountainous terrain). The Levantine cities were mercantile in nature; people dealt with one another according to a clear protocol, preserving a peace conducive to commerce, and they socialized quite a bit across communities. This millennium of peace was interrupted only by small occasional friction within Moslem and Christian communities, rarely between Christians and Moslems.

It is as difficult to avoid bugging others with advice on how to exercise and other health matters as it is to stick to an exercise schedule.