It's generally undesirable to have adjacent nodes in a way that are actually or nearly in the same place, but it can be difficult to find such instances visually. iD should flag these and offer to merge the points.

Haha strong agree.. these drive me nuts.
Same here
Semi-related to this, what about offering to simplify straight lines with multiple untagged/connected nodes along their length?
Semi-related to this, what about offering to simplify straight lines with multiple untagged/connected nodes along their length?
We don't currently offer a great line simplification operation in iD. This is being tracked on #3116.
done in #6267
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We don't currently offer a great line simplification operation in iD. This is being tracked on #3116.