Best option here is to ignore those people that spout crap thinking they know what things are.
Trust those with proper signatures and/or post counts.
If you create a road from nowhere to the dead end, then delete the new road, it should result in a terminated end (junction node). The reason this is needed is for navigation as waze gets confused if it thinks it's facing towards the dead end, and will give the "proceed to highlighted route" thing. Have also seen it play with TTS (maybe another issue), and starts a route far from your location (again, maybe a local issue).
Bottom line, waze navigates from junction to junction. Without these nodes, it gets confused and messes up.
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Edit: Kuhl I realise you were the last poster, the first paragraph was not aimed at you or anything
just to avoid confusion here.