> Today, after the invention and normalization of opinionated autoformatters, it means that the autoformatter can't figure out for me how my code should be indented

This is precisely why I prefer significant space: it forces you to write tidy code. Sloppily written code that depends on the autoformatter to be properly indented makes me suspect the logic could be sloppily written too.

Besides, any humble plain text editor understands autoindenting, so there's no sensible reason to not indent properly.