I don't follow Godot too close, but wasn't the big change also from 3.x to 4.x also migration from OpenGL to Vulkan? That's a rewrite of the rendering engine, w

I don't follow Godot too close, but wasn't the big change also from 3.x to 4.x also migration from OpenGL to Vulkan? That's a rewrite of the rendering engine, which is a big part of a game engine, that most likely also affect a lot of other aspects of the engine.