There would definitely be a bromide increase in developers used in tanks and replenished like 777, DK-50 and HC-110. One wonders then, why not add more KBr as a restrainer up front? I suppose from the manufacturer's point of view, this would decrease the life of the developer, but if you know you like it that way, it wouldn't be unreasonable so as not to have harsh results on the first batch, and then you could just keep replenishing.
Pyro is a one-shot developer, so bromide isn't the issue. It's something to do with the alchemy of aging.