Doesn't require a note in the developer changelog but we should ideally mention this in the changelog as it is changing the behaviour for people that actually want to use it.
Tested it locally and worked.
Guess it makes sense to set it empty by default. Regarding mentioning it in a changelog: Might it make sense to trigger a notification within Matomo after updating to explain the possible change to the super user once?
I reckon it's not needed as long as it is mentioned clearly in the regular changelog. I suppose not too many people are too keen on how this feature worked previously and might maybe rather confuse people?
Guess you're right. The page title report might not be one of the frequently used reports at all