The only exception where the signatures are really long and complex are parts of the collection infrastructure, because Scala developers tried to make it work as intuitively for users as possible: E.g. making non-collection classes support collection operations, always returning the most "precise" type, etc. etc, which is very hard and painful work not done in any other language to this day.
In the end while I hope signatures get shorter and more like the use case signatures already existing in documentation, I don't think it matters much.
Untyped languages have more or less no useful signature at all and they are still pretty much alive.
The only exception where the signatures are really long and complex are parts of the collection infrastructure, because Scala developers tried to make it work as intuitively for users as possible: E.g. making non-collection classes support collection operations, always returning the most "precise" type, etc. etc, which is very hard and painful work not done in any other language to this day.
In the end while I hope signatures get shorter and more like the use case signatures already existing in documentation, I don't think it matters much.
Untyped languages have more or less no useful signature at all and they are still pretty much alive.