You are correct. I don’t mean to say they’re not important notices. I just didn’t want my end users to have to deal with them while I debugged.
I’ve only run into 2 addons that needed updating (so far):
Dreamscape’s Invisible Captcha extension
Solspace’s Flickr Tools plugin
The Flickr Tools plugin put 10 of these messages on the front end of the site which really messed up the layout and formatting. The Captcha plugin only gave me the error on the Extensions tab in the CP.
Dreamscape responded within an hour of my question to him and I figured out the fix for the Flickr tools on my own.