Elias Vaughn wrote:
The Federation agreed not to use something they wouldn't use anyway ...
Excuse me, but the Defiant on DS9?
There were a lot of situation, not involving the Romulans (or even the Klingons) where a Starfleet ship would have found a on board cloaking device useful, and could have saved lives.
In Tomorrow is Yesterday, simply raising the ship's deflector prevented the Enterprise from being detected on radar. And that just deflectors. Janeway used a type of cloaking device to penetrate a Borg unimatrix.
If a cloaking device can be used during an attack on the Borg, imagine how many lives could have been saved at Wolf359.
Starfleet could have used hundreds (or thousands) of cloaking devices in their long war against the Cardassians, shorting the war, and saving lives. Ending the war with a surrender, not a treaty. None of those border colonies would have gone to the Cardassians.
This would have also put the Federation in a position afterwards to end the Cardassian occupation of Bajor. Something they likely couldn't do with a active war in progress.