But using alignment doesn't mean you are childish. It's just a bad habit that leads to many problems.

A couple of examples from the Servo source code, whose coding standard at one time required column alignment:

    let construction_item = ConstructionItem::TableColumnFragment(Fragment::new(node,
                                                                                specific));
  
    self.set_flow_construction_result(&kid,
                                      ConstructionResult::Flow(kid_flow,
                                                               Descendants::new()))

Another example from an earlier version of the code:

  ConstructionResult::ConstructionItem(ConstructionItem::Whitespace(whitespace_node,
                                                                whitespace_style,
                                                                whitespace_damage)) => {
      ...
  }

If you use indentation instead of alignment, these problems never happen. And in fact, the Servo coding standard finally allows the use of indentation, and this particular call has been changed to use it.

Now back to the question of tabs and spaces. If you use tabs and only use indentation with no alignment, then it doesn't matter what anyone uses for their tab width. The code will always look perfect whether someone likes their tabs rendered as 2, 4, 8, or any number of spaces.

The code will also look fine for someone like me who prefers proportional fonts. In fact, I think every developer should try using a proportional font for a while. It's a good way to get over the bad habit of column alignment.