Not sure the case that the parent refers to, but there's a good reason that CTRL-F in the Win95/Exchange Mail client and Outlook will invoke the Forward email message command.

It goes back to what is the common action that the user would perform in the app. Forwarding an email is more common that Finding text in an email - at least to Billg.

see https://devblogs.microsoft.com/oldnewthing/20140715-00/?p=50...