I think that at least a partial sub-opt is justified, as having e.g. Settle and Hunstanton in the same single uber-region is not ideal. But the
Leeds/Hull split for all bulletins was perhaps never truly necessary.
The pan-regional/sub-regional compromise approach has long worked well for Look East, after all.
And, of course, for all non-news stuff (e.g. Inside Out, Sunday Politics, and the now-defunct Late Kick Off) the whole Yorks & Lincs region has continually remained un-split anyway.
Plus, of course, the Breakfast bulletins reverted to being pan-regional a couple of years ago - albeit presented from Hull rather than Leeds.