The argument that certain features are optional overlooks the fact that other people can and will use them, especially in collaborative projects. That's not a

The argument that certain features are optional overlooks the fact that other people can and will use them, especially in collaborative projects. That's not a death knell. You can gate the features behind style guides, linters, or social conventions. However, those are costs in and of themselves. Additional features of a language always have a carrying cost, even behind optional flags.