It is very, very rare that I don’t want to have a date associated with a note.
Sometimes I want to change a notes date, but most of the time, I just want the date of the note to be “now,” because I am entering the note “live,” so to speak.
Notes do not have an associated date. This makes it hard to find notes that I put into Agenda yesterday, for instance, because sometimes I forget to attach a date to the note. Then when I click on Yesterday, or Today, I see “No notes” — when in fact I know there are many.
Notes should have a default date of the time they are created.