Welcome to the forums @gnat!
While I'm not against the idea of discussing potential changes here on the forums, most of the main Godot developers are not active on the forums. I would highly suggest making any proposals on the Godot proposal GitHub repository so then it can be seen by the more of the main developers :smile:
On the topic itself, I agree with @cybereality, as I think it not being forced to have a splash screen by default is one of the strengths of Godot, especially given how it backfired for Unity developers. That said, having a checkbox or something to add an official, Unreal-Engine-like Godot-splash screen (that is off by default) might be an interesting addition, though it might be better as a plugin since then users who don't want/need it don't have any extra code or assets.