Thank you for the suggestion.
Some apps focusing on security like StandardNotes and 1Password support the lock feature, which seems to be useful.
However, I basically assume that your computer is always used by you.
You have to lock your computer itself every time you leave it so that someone else can’t use it.
When you need to allow someone else to use it, I think, just logging out is sufficient to protect your notes.
Allowing other person to use your computer involves a large security risk that he/she could see your personal information in many ways such as local files in your hard disk, email client, calendar, browser with a lot of credentials, etc. And the system basically assumes that a current user is you. Do you need all apps to support the lock feature?
I don’t mean that I completely disagree with you.
I just would like to know why it’s so necessary, especially for Inkdrop.