Except in your examples, that content begins, you learn the mechanics, etc, and sure, by the zillionth time you've done it, it can seem wrote and boring.

Camping, is literally waiting for the content to begin, the combat may be engaging the first time you do a world HNM also, I full well admit that, but the time spent waiting around to maybe get a chance at the actual content, is ridiculous.

Fun is definitely subjective, but by that argument you could be basing your game design around the few people who really enjoy poking themselves in the eye with needles. Camping HNM is not something most people find fun, and dev time should be spent on things that more than a tiny percentage of the population want. Fun may be subjective, but the statistic of how many people would enjoy content like this versus how many would dislike it, is not.