Yes. And since 90 % of the game are started as France, Spain, Portugal, Sweden, England, Russia and Ottomans I support the idea of restricting the player to only theses countries, Eu 4 team has already too much work.
Apples and oranges.
Fleshing out the ROTW has the benefit of improving the game experience for every nation, not just the ROTW. Example: in 1.7, when Spain/Portugal made landfall in South America, all they found was a poor, single Incan blob and one or two poor Mesoamerican blobs. Now? More tags with more native BT to conquer (instead of mindlessly colonize), more native diplomacy to meddle in, more native nations to protectorate or ally, and potentially large native empires that aren't entirely incapable of putting up a resistance to the conquistador invasion (I just witnessed an AI Cusco repelling Portugal in the Andes!)
The additions that make the ROTW more fun to play also make European nations more fun to play. Spending development manhours on later start dates has no bearing on the 1444 start.