pointofyou
Hero
The 1e DMG has several examples of play but they aren't much like any of the play I remember. It's possible that examples of play are not the best way to teach play. This would include watching streamed play.AD&D had Basic (and maybe the PHB) as the training manual for beginners.
2e had Basic and there was an example of play in the PHB
3.5 DMG had an example of play
4e DMG had an entire Starter Set at the back of the DMG, because they made so much space in the book by inserting all the magical items in the PHB, as the 4e PHB only covered 1/2 of the playable options that existed in previous editions.
In 5e, they decided to not include an example of play (its not worth talking about the excerpt in the PHB) and stuck it in the Starter Set.
The books can always improve, but what my point is, the decision not to include an example of play in the 5e DMG was purposeful, and not a failure of the DMG itself, but rather indicative of who, WotC believed, each product they published was marketed for.
The 1e DMG has several strongly-worded passages explicitly telling the DM to run certain things in certain ways. There is none of that in the 5e version. Most of the variant approaches and optional rules are presented without comment or any reason why a DM would choose them.
I think your bolded text includes an important truth. WotC were publishing the 5e books including the DMG for people who'd played previous editions. Now they are in a position where there are players and DMs coming to the game without that previous experience and they are finding the rules need revision and reorganization.