Go back and read the links. GB didn't leave out the feature to dial when the screen is LOCKED. That has been disabled since the beginning.
The difference is, on FroYo, you just turned the screen off... not locked it.
On GB, Google added the slide to lock.
I posted several links. As I said, this shows that the "No voice dial when LOCKED" has been around since 2009.. It was not "Left out" of GB.
Issue 4848 - android - Have voice dial work through bluetooth - very important driving safety isse! - Android - An Open Handset Alliance Project - Google Project Hosting
(Like you, I agree it's a stupid decision, and so do the people posting there. But, it's Google's call, not ours.)
It's not a PROBLEM. A problem means there is something wrong, or defective. This is a change in how the OS behaves when the screen is turned off. They added the slide to lock (A very popular feature for some reason... I can't stand it!). This locks the phone, even without a password. You may not like it. But, that does not make it a problem with the OS. Just a problem to you.
We found your issue.
I've provided you with 2 solutions...
-a free one that I use and know to work, the No Lock app
-a paid one, WidgetLocker, that many others use.
There are 2 choices for you on how to get around the changes in the OS.
Or, you can go on with how you are doing it now.
But, I've spent several hours of my Saturday night researching this for you. I'm leaving it up to you to decide where you want to go from here.
My final advice is to just download the No Lock app I linked you to and use it. That guy "Locking and unlocking" his phone is showing how you enable and disable the locking.