Literally just code with long lines. You run into this particularly with monadic stuff like LINQ queries.

I grepped up some old LINQ code I wrote (sanitized as it's not open source):

  var list = obj.FindDataNear(a, b...).Select(i => obj.GetPosition(i))
      .Where(...long lambda...)
      .MoreLINQ()
      .ToList();

So with the style I used, the semicolon is superfluous due to indentation. Are there styles where the semicolon is useful?

> So with the style I used, the semicolon is superfluous due to indentation.

Eh, indentation is also conflated with block delimitation. The semicolon is still useful to more strongly indicate statement delimitation at a glance.

Yes, it's redundant, but so are many signifiers around us. The pity is that readability aspects aren't semantically relevant but are stored as if they are.