User case:
- open the same page on two tabs
- edit tab 1
- edit tab 2
- change something on tab 1, save
- change the same element with a different content on tab 2, save
With wikitext, you have an edit conflict warning, not with VE.
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I guess it's not obvious what's really going on here. VisualEditor doesn't detect edit conflicts itself - we just send off data to the MediaWiki edit API.
MediaWiki's edit conflict handling will suppress the edit conflict error if the second save to be made is full-page (not just a section edit) and the saving user is the last editor of that page - i.e., self-conflicts are suppressed for full-page edits.
All VE saves are full-page (currently, anyway), so you need to be comparing it to full page wikitext edits for any comparisons about edit conflict behaviour to make any sense.
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Oh, and to make things slightly more confusing - the "saving user is the last editor of that page" check will never suppress full-page self-conflicts for anonymous users. It only works for logged in users.
And new sections never trigger edit conflicts.
There are probably more cases...