Can't comment on Google specifically but hidden scrollbars mean I often don't realize a dialog has scroll bars until I reach out into the dark edges to find wha

Can't comment on Google specifically but hidden scrollbars mean I often don't realize a dialog has scroll bars until I reach out into the dark edges to find what I hope is there. Microsoft will even harness this as a dark pattern to hide options they don't want you to choose. Perhaps your dad simply expected to scrollbars to be visible like they initially were.