Overall named parameters story could be improved in couple of areas IMO, from top of my head:
• named parameters are notoriously difficult to get as one of the first IDE suggestions on cmd+space/cmd+shift+space
• it's not possible to encourage or force IDE (e.g. with an annotation) to use named parameters for a given class/package
• adding new parameters doesn't by default append parameter name even if all the existing parameters already have names (so it's almost certain new parameters should also use names)
• the issue I linked, incredibly annoying, conversion from named parameter to a trailing lambda on any refactor