IMHO that's a strong reason against a freeze on giving karma until the
package has been in testing for a certain amount of time. In fact, I
sometimes give +1 on updates that haven't been pushed at all yet. One
example [1]: I reported a bug, I received a notification that a bugfix
is pending, I immediately downloaded the package, tested it and gave my
feedback. Now, if there was a freeze, I would have to come back later
and see if I'm already allowed to give feedback. Most likely, I would
have never given my +1.